James J. Nawarskas, PharmD, BCPS

• Associate Professor, Department of Pharmacy Practice and Administrative Sciences, College of Pharmacy, University of New Mexico, University of New Mexico, Albuquerque, New Mexico

Imagine you are sitting across from a client and you ask him or her to write the word dog anxiety symptoms head cheap 150 mg effexor xr visa. His or her brain would then search for a known written word in the orthographic output lexicon to match this auditory stimulus anxiety 1 week before period buy effexor xr 37.5 mg visa. Next this item would be sent to the graphemic buffer anxiety 9 dpo buy effexor xr mastercard, a type of working memory meant to store this written word form long enough to write it anxiety fever generic effexor xr 37.5 mg buy online. Here the word dog would be converted into print or cursive and into uppercase and lowercase as appropriate anxiety upset stomach 37.5 mg effexor xr purchase with amex. The next stage, graphomotor programming, involves motor planning for the hand to make the correct motions with a pen to write the word dog. Central agraphia involves impairment in the underlying linguistic writing system and occurs higher in the dual-route model. Both of these categories of agraphia are discussed in the following sections along with their subtypes. Peripheral Agraphias Graphemic agraphia is a problem with graphomotor execution of writing and spelling due to attentional issues. This form of agraphia is caused by lesions to the left prefrontal cortex and left parietal lobe. Patients with spatial agraphia have difficulty writing accurately on a horizontal line. They may also write on one side of the paper or the other or will make extra marks on a letter. It is a deficit in graphomotor execution usually caused by damage to the right hemisphere. Allographic agraphia involves errors in allographic conversion of lowercase versus uppercase letters. The final form of peripheral agraphia is apraxic agraphia, a disorder of graphomotor programming, in which people have impairments carrying out the motor plans Types of Agraphia There are two basic types of agraphia, peripheral and central agraphia. Peripheral agraphia includes writing problems due to visuospatial processing and attentional problems. They will struggle to hold a writing utensil correctly and will search and grope to write letters correctly. Central Agraphias Central agraphias are linguistically based and occur higher in the dual-route writing model. For example, deep agraphia (or semantic agraphia) is characterized by semantic paraphasias. These patients can write regular and irregular words but have difficulty with nonwords or nonconcrete words. Damage to the extrasylvian temporoparietal regions of the left hemisphere are usually associated with this form of agraphia (Beeson & Rapcsak, 2004). Patients with this type of agraphia cannot hold written forms in their linguistic working memory long enough to write the word. Shorter words are easier to write than longer words are because shorter words require less graphemic buffer space (Papathanasiou & Cséfalvay, 2017). Summary of Learning Objectives 285 Conclusion There are many things we humans take for granted in our lives, and our ability to express ourselves through language may be one of those things. It is certainly extremely complicated neurologically, using a vast array of networked structures. Its complexity is very difficult to capture, as the Wernicke-Geschwind model illustrates. Imaging studies as well as case studies do lend support to some kind of altered form of this model. First, the size and location of language areas are different from patient to patient. Second, the model does not take into consideration subcortical regions that may be involved in language. Third, the reliance on case and imaging studies may be problematic, especially if these studies are not taking into consideration areas that are subtly involved. These impulses travel down the visual pathways to the lateral geniculate nucleus of the thalamus. Our idea is sent to the left inferior frontal cortex where semantic and phonological encoding occurs, probably with the help of surrounding areas. The plan to speak is sent to the supplementary motor area that initiates the motor plans. These plans are sent to the primary motor cortex, which activates speech muscles via the motor speech system. Writing occurs through the cooperation of the superior parietal lobe (imagining 2. Peripheral alexia involves reading problems due to visuospatial and attention problems. Using the following Brodmann map, sketch a flow of neural information in the following tasks: auditory comprehension, visual comprehension, oral production, and written expression of language. Draw a diagram that displays the different classical aphasias, including their similarities and differences. Fill out the following chart using a positive sign (+) for relatively intact and negative sign Nonfluent Aphasias Category or Feature Fluency Auditory comprehension Repetition 5. While trying to describe a basketball game that had just ended, she said the following: "well, a very, very heava-ah-heavy-de-bertation tonigh. Search the scholarly literature and find a case study involving aphasia, alexia, or agraphia. Pretend you have been asked to write an encyclopedia entry on aphasia, alexia, or agraphia. Neuroscience: Neuropsychology, neuropsychiatry, behavioral neurology, brain and mind. Visual presentation of single letters activates a premotor area involved in writing. Like speech, swallowing is a complex process involving a number of muscles, nerves, and even glands. The learner will correctly identify the cranial nerves involved in each step of the normal swallow. The learner will list neurological disorders that cause dysphagia and note the specific nature of the swallowing problem for each disorder. Introduction the Normal Swallow · the Oral Preparatory Stage · the Oral Stage · the Pharyngeal Stage · the Esophageal Stage the Central Swallowing System · Brainstem Involvement · Subcortical and Cortical Controls · Neurology of the Cough Response · Neurology of Silent Aspiration Neurological Swallowing Disorders · Causes · the General Nature of Neurogenic Dysphagia · Specific Neurological Conditions Involving Dysphagia Conclusion Summary of Learning Objectives Key Terms Draw It to Know It Questions for Deeper Reflection Case Study Suggested Projects References 289 290 Chapter 13 the Neurology of Swallowing Introduction When not eating, the average person swallows approximately two times per minute while awake and once a minute when sleeping. If the number of swallows when eating were factored in, human beings swallow many thousands of times during an average day. In this article, both the peripheral and central swallowing systems will be surveyed. Essentially, solid and semisolid foods are masticated and mixed with saliva, forming a puree consistency, which makes swallowing safer and more efficient. Oral breathing ceases and nasal breathing takes over due to a labial seal being established and maintained in order to keep food in the oral cavity. The main chewing muscles include the following mandibular elevators: masseters, temporalis, and pterygoid muscles. The masseter closes the mandible, which facilitates cutting food using the central and lateral incisors. The temporalis and the medial and lateral pterygoids are the prime muscles for grinding food via the molars. These muscles include the mylohyoid and the anterior belly of the digastric muscle. Gland Secretion Saliva is an important component in the process of breaking foods down for swallowing. It consists mostly of water, with the remaining portion being enzymes that break down foods. Soft palate blocks the nasal cavity the Oral Preparatory Stage the oral preparatory stage is voluntary and variable in length, depending on the substance being eaten. However, the fact that you can exercise voluntary control is used in some swallowing therapy maneuvers. The anterior tip of the tongue rises and its posterior portion drops, forming a ramp. During this activity, the labial seal is maintained and nasal breathing continues. The larynx elevates and moves forward and the epiglottis lowers, directing the bolus toward the esophageal segment. Simultaneously, the cricopharyngeus muscle at the top of the esophagus relaxes, allowing the bolus to enter the esophagus. Soft Palate Closure Soft palate elevation is crucial in keeping liquids and solids out of the nasal cavity during swallowing. The musculus uvulae muscle, innervated by the vagus and accessory nerves, also assists these muscles by shortening and raising the uvula. It innervates the muscles of the face via special visceral efferent fibers, especially the lip muscles. Its special visceral afferent fibers convey taste information to the brain from the anterior two-thirds of the tongue; its general visceral efferent fibers stimulate the production of saliva used to keep the mouth moist and to help in the breakdown of food during mastication. Tongue Retraction In addition to playing an important role in innervating the chewing muscles, the trigeminal nerve is responsible for tongue retraction via innervation of the digastric and mylohyoid muscles. This action is important in the oral stage of the swallow when the tongue forms a ramp to move the bolus from the anterior portion of the mouth to the posterior. Laryngeal Closure During the pharyngeal stage of the swallow, the larynx closes three valves to prevent food and liquid from penetrating the airway, which could lead to aspiration. First, the cartilaginous epiglottis closes over the top of the larynx and, thus, guards the airway. The aryepiglottic and thyroepiglottic muscles, when contracted, lower the epiglottis. Both of these muscles are controlled by the recurrent laryngeal branch of the vagus nerve. These thick folds of mucous membrane are brought toward midline as the true vocal folds contract. The intrinsic adductor muscles are the most relevant in swallowing because these adduct the vocal folds during swallowing. There are three adductor muscles, the lateral thyroarytenoid and the oblique arytenoids, which are paired, and the transverse arytenoid. All three of these muscles are innervated by the recurrent laryngeal nerve of the vagus. The tongue is obviously crucial to the oral stage of the swallow in gathering up the bolus and moving it posteriorly to the pharynx. The intrinsic and extrinsic tongue muscles control the shape of the tongue and are responsible for not only forming the ramp the bolus will travel down but also squeezing the bolus through the oral cavity. The Pharyngeal Stage the pharyngeal stage is essentially involuntary, though one could exert conscious control over it. As the Laryngeal Elevation During the pharyngeal stage of swallowing, the larynx elevates under the epiglottis. This is achieved the Central Swallowing System 293 through several extrinsic suprahyoid muscles, which include the digastricus, stylohyoid, mylohyoid, geniohyoid, hyoglossus, and genioglossus. The mylohyoid also has its nerve supply from the mandibular branch of the trigeminal nerve. The geniohyoid is controlled by cervical spinal nerve 1 through the hypoglossal nerve. These muscles form a muscular tube that, when contracted, squeezes the bolus through the pharynx to the esophagus. This squeezing action is initiated when the bolus meets sensory receptors near the faucial pillars, tonsils, and soft palate. The Esophageal Stage the esophageal stage is an involuntary stage; like the oral preparatory stage it is variable in length (8­20 seconds), depending on the substance eaten. When not swallowing, the cricopharyngeus muscle contracts to prevent reflux, and respiration resumes. The cervical esophagus is approximately 4 to 5 cm long and is made up of striated muscle. It meets the stomach at the lower esophageal sphincter (Corbin-Lewis, Liss, & Sciortino, 2005). Sequential, wavelike muscle contractions, referred to as peristalsis, move food through the esophagus. These contractions are coordinated by the medulla, with the proximal end of the esophagus contracting while the distal end is relaxed. The striated muscle in the cervical segment is controlled by parasympathetic fibers of the vagus nerve, and the thoracic and abdominal portions are controlled by the enteric nervous system. The process of swallowing is a complicated, dynamic process, and staging it is a helpful but artificial way of conceptualizing it. The cricopharyngeus muscle, which powers this valve, is normally contracted but relaxes as the bolus reaches the posterior pharyngeal wall. Esophageal Constriction the esophagus is an 18- to 25-centimeter (cm)-long tube that is collapsed when not containing food or liquids. It can be divided into three segments: the cervical, thoracic, and abdominal esophagus. This series of illustrations demonstrates a lateral view of bolus propulsion during the swallow: A. The oral stage uses the tongue to voluntarily move the bolus toward the back of the mouth; the soft palate raises to prevent nasal regurgitation.

Responses in the dorsal accessory olive of the cat to stimulation of hind limb afferents anxiety symptoms versus heart symptoms purchase effexor xr 75 mg with amex. Equal numbers of neuronal and nonneuronal cells make the human brain an isometrically scaledup primate brain anxiety symptoms cold hands purchase effexor xr 37.5 mg fast delivery. Inferior olivary neurons in the awake cat: detection of contact and passive body displacement anxiety high blood pressure buy effexor xr on line. Divergence and convergence of thalamocortical projections to premotor and supplementary motor cortex: A multiple tracing study in the macaque monkey anxiety depression symptoms cheap effexor xr 150 mg with visa. Frequency-dependent functional neuromodulatory effects on the motor network by ventral lateral thalamic deep brain stimulation in swine anxiety wrap buy effexor xr 75 mg on-line. Cerebellar speech representation: lesion topography in dysarthria as derived from cerebellar ischemia and functional magnetic resonance imaging. The spinal cord must be viewed from both longitudinal and cross-sectional orientations in order to make sense of its components and function. The vertical or longitudinal structure can be likened to a series of strands of a rope, where the rope is the entire spinal cord and the strands are the various tracts. The spinal cord is also divided structurally by the vertebrae, providing a segmental view of the spinal cord. We are sensate creatures, and our cerebrum is designed to take the sensation it receives, make some sort of sense of it, and act on that sensation. This total function requires the existence of pathways that convey sensory information from the periphery, as well as the mechanism for sending motor commands to the periphery. Without afferent (sensory) and efferent (motor) pathways, our cerebral cortex would be out of a job! As a thought experiment, imagine being born with no sensory input to the brain and no way to act through muscular contraction. This new brain that had never had any sensory input would have no history, no memory to work with, and no information to process. You might want to take a look at Table 9­1 to see how much work your spinal cord does! While loss of mobility is a significant and striking issue for those with spinal cord injury, there are many other conditions that arise from the injury, including loss of bladder control, loss of arm and hand strength, and affected sexual function. Injury at the cervical level will result in loss of upper and lower body function, a condition known as tetraplegia. Injury at the thoracic level will spare the arms but will result in paraplegia (affecting both lower limbs). Loss of bowel and bladder function following spinal cord injury is typical, although therapy can aid in regaining control for many individuals. Damage above the T6 level can place the patient at risk for autonomic hyperreflexia, in which the body responds to a noxious stimulus with a dangerous spike in blood pressure, placing the patient at acute risk for stroke. Spasticity of muscles below the level of the spinal cord injury is typical, as are contractures (Crewe & Krause, 2009). Pediatric spinal cord injury makes up approximately 5% of all spinal cord injuries (Proctor, 2002). Because neck pain is emblematic of spinal cord injury, the ability of a small child to report focal injury is limited, making diagnosis difficult. Neonatal spinal cord injuries are relatively rare, and typically involve the cervical vertebrae. These injuries can occur when physical manipulation of the neonate during birth is required, damaging the spinal cord. Odontoid fracture (fracturing of the odontoid process of C2 due to rotatory force) can occur, but congenital odontoid malformation is a more common cause of C2 damage (Proctor, 2002). In reality, it is actually a set of columns, but these columns have different sites of origination and termination. That white matter you see actually represents the various tracts of the spinal cord. As with the rest of the central nervous system, the spinal cord is wrapped in meningeal linings. The medulla oblongata of the brainstem is an upward extension of the spinal cord, both physically and in terms of function. The spinal cord has aggregates of neuron cell bodies that serve motor function, and there are cell bodies in ganglia lying outside of the spinal column that provide input for afferent information. The spinal cord has numerous basic reflexive functions, similar to those found in the brainstem. The critical difference between the function of the spinal cord and brainstem is one of complexity. The spinal cord really does reflect the basic unit of the nervous system, with the structures above it being more complex versions of the basic functions seen at this level. Vertebrae are designated by letter and number reflecting that structure: C1 through C7 represent the seven vertebrae of the cervical spinal column, T1 through T12 correspond to the thoracic vertebrae, L1 through L5 reflect the lumbar region, and the sacrum (S) is a fused unit. The cervical vertebrae begin with the atlas (C1), which supports the skull and marks the superior end of the spinal cord, and the axis (C2), which is immediately below the atlas. These vertebrae have unique features that set them apart from all other vertebrae. The other five cervical vertebrae have similar structure but are unique in the vertebral column for having a passageway for vascular supply to the brain (the transverse foramina), to be discussed. The spinal cord is contained within spinal meningeal linings and suspended by denticulate ligaments. The denticulate ligaments arise from the pia mater and attach the spinal cord to the vertebral column. At the lower end of the spinal cord is a cone-shaped projection known as the conus medullaris. A fibrous projection from the conus medullaris called the filum terminale ("end filament") joins with the dural tube and then becomes the coccygeal ligament. The spinal nerves are related to each vertebra: the first spinal nerve (C1) arises from the spinal cord on the superior surface of the atlas (C1 vertebra), while spinal nerve C2 arises from below C1. Thus, there are 8 pairs of cervical spinal nerves instead of 7 (corresponding to seven cervical vertebrae). The subsequent nerve origins make logical sense with reference to the vertebrae: there are 12 pairs of thoracic nerves, 5 pairs of lumbar and sacral nerves, and 1 pair of coccygeal nerves. The spinal nerve notation follows the notation we talked about for vertebrae, with the first thoracic spinal nerve being T1, and so forth. Vertebral column, showing cervical, thoracic, lumbar, sacral, and coccygeal portions. The reason lumbar punctures to sample cerebrospinal fluid are given here is that the risk of injury to the spinal cord is greatly reduced. Because mobility is an issue following injury, treatment of pressure ulcers is critical. Electrical stimulation has been shown to be an effective treatment for these ulcers. Electrical stimulation can also aid in bladder control (Liu, Moody, Traynor, Dyson, & Gall, 2014) and in reducing muscle atrophy (Baldi, Jackson, Moraille, & Mysiw, 1998). Computer-controlled electrical stimulation is being used to provide movement and control for individuals with spinal cord injury (Ragnarsson, 2008). In reality, there is overlap in the dermatomes, which provides a degree of redundancy. The motor representation is not as clearly represented because muscles span various distances that cross dermatome regions, and activation of these muscles often uses networks of nerves, known as plexuses. During prenatal development, the spinal cord fits perfectly within the canal, but as the body develops, the canal becomes larger than the spinal cord. The result of this is that the spinal cord is shorter than the vertebral column, leaving a space in the lower aspect that has only nerves passing through it to serve the lumbar and coccygeal regions. Recognize that the dermatomes actually have overlap, so that two nerves will serve some of each dermatome. The gray area represents cell bodies of neurons, while the white is composed of myelinated fibers of the neurons. The gray matter is further divided into the posterior gray column (also known as the posterior horn) and anterior gray column. The posterior gray includes cell bodies of interneurons that connect, among other things, the efferent input to the motor fibers that serve muscle. These myelinated fibers make up the tracts of the spinal cord that allow communication between the brain and the periphery. On the same figure, you can see the central canal, which is continuous with the fourth ventricle of the brain. The ventral root consists of fibers that are exiting the spinal cord as spinal nerves and which are destined to activate muscle. Realize that there are no "ventral root ganglia" here, because a ganglion is an aggregate of cell bodies with a functional purpose, and the cell bodies for the motor nerves are within the ventral gray of the spinal cord. We saw this same design with several of the cranial nerves of the brainstem, where we found the motor cranial nerve nuclei within the brainstem, but some of the afferent nuclei (such as the trigeminal ganglion) outside of the brainstem. The spinal nerves divide into separate rami or divisions: the dorsal rami serve the muscles of the posterior body, while the ventral rami serve the anterior body. Some of the fibers of the ventral rami serve the autonomic nervous system, which resides as a parallel system outside of the spinal cord. In summary, · the spinal cord is suspended by denticulate ligaments that arise from the pia mater and attach the spinal cord to the vertebral column. The filum terminale joins with the dural tube of the spinal cord and becomes the coccygeal ligament, which attaches to the coccyx. The spinal cord is shorter than the vertebral column, leaving a space in the lower aspect. The gray area is composed of neuron cell bodies and the white, myelinated fibers of the neurons. The ventral root con- sists of fibers that are exiting the spinal cord as spinal nerves and that will activate muscle. At the most basic level, afferent pathways of the spinal cord convey information from peripheral sensors to the central nervous system, where it can be processed. In between these two conduits lies the actual processing of the afferent signal and a "decision" about how to (or whether to) act on it. In all cases, however, information has to be received in order to be processed and acted upon. The pathways of the spinal cord are longitudinal in nature, but are best seen in transverse slices of the spinal cord. Generally, the spinal cord gets larger as it ascends because more pathways are added. The spinal cord is grossly divided into dorsal, lateral, and ventral funiculi made up of white matter (a funiculus is a large column). We mentioned the cervical and lumbar enlargements earlier: there will be more gray matter in areas that serve more muscle (segments C3 to T2 and T9 to T12). Tracts of white matter are widest in the cervical region because all descending and ascending fibers must pass through those segments. Spinal or cranial nerve V ophthalmic V maxillary V mandibular C2 C3 C4 C5 C6 C6, C7, C8 T1 T2 T4 Body region innervated by somatic afferent cranial and spinal Nerves Spinal or cranial nerve T10 L1 L2 L3 L4 L5 S1 S2 S3 S4 S5 Body region Upper face, anterior scalp Middle face, maxilla, upper dentition Lower face, mandible, lower teeth, external ear, and ear canal Occiput Neck Neck, upper shoulder Upper arm, proximal Upper arm, distal Fingers Upper thorax; inner lateral arm Proximal inner arm Nipple area Body region Umbilical girdle area Inguinal area Lateral thigh Knee Great toe, lateral thigh, medial leg, calf Calf, shin Posterior shin, heel Posterior thigh Medial thigh Buttocks Around anus Source: Based on data of Noback, Strominger, Demarest, & Ruggiero (2005). Remember that these pathways get their input from the sensors of the body, such as stretch sensors, pain sensors, and tactile sensors. First-order neurons are the first neurons in the chain, such as afferent neurons passing information into the spinal cord. The next neuron in this communication chain is the second-order neuron, and so on. Posterior Funiculus: Fasciculus Gracilis and Fasciculus Cuneatus Within the posterior funiculus pass the fasciculus gracilis and fasciculus cuneatus. This sensory information is conveyed within the dorsal root ganglion of the spinal cord by means of unipolar neurons whose axons ascend ipsilaterally through the spinal cord. The fasciculus gracilis mediates information from the lower extremities, while the fasciculus cuneatus serves the cervical regions. The nerve tracts terminate in the medulla oblongata at the nucleus gracilis and nucleus cuneatus. Fibers from these two nuclei decussate and ascend as the medial lemniscus, which terminates in the thalamus. The relationship between specific parts of the body being stimulated is projected on the cortex in spatiotopic array, so that there is a sensory map developed to represent the body. Damage to these pathways can result in deficits of touch discrimination of the hands and feet, as well as loss of sense of the position of body in space (proprioceptive sense), resulting in a gait impairment. Axons from the first-order neurons enter the spinal cord and synapse with second-order neurons, whose axons decussate at the level of entry of up to three segments above that point. Dorsal root fibers entering the spinal cord synapse with interneurons, which in turn synapse with third-order neurons that decussate and ascend. This information travels ipsilaterally in an uncrossed tract to the level of the cerebellum. Sensory information enters the spinal cord via dorsal root ganglia, with first-order neurons bifurcating to ascend and descend to locations above and below the point of entry. The first-order neurons synapse at the dorsal nucleus of Clarke, with second-order neurons ascending ipsilaterally to the medulla oblongata, entering the inferior cerebellar peduncle, and terminating in the caudal and rostral vermis of the cerebellum. The anterior spinocerebellar tract carries similar information but ascends as a contralateral pathway to the superior cerebellar peduncle. In summary, · the spinal cord is grossly divided into dorsal, lateral, and ventral funiculi made up of white matter, and funiculi are further divided into fasciculi. The fasciculus gracilis mediates infor- mation from the lower extremities, while the fasciculus cuneatus serves the cervical regions. The fasciculi gracilis and cuneatus nerve tracts terminate in the medulla oblongata at the nucleus gracilis and nucleus cuneatus.

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The visual method provided information regarding the progress of the treatment of tumors after oral treatment [50] anxiety symptoms lasting all day order cheap effexor xr on-line. Further anxiety symptoms while sleeping cheap effexor xr 75 mg on-line, it acts as the first set of in vivo studies that demonstrate the effectiveness of the tested nanoformulation anxiety symptoms vision problems generic effexor xr 37.5 mg mastercard. Pharmacokinetic profiling is accomplished by withdrawing blood samples from the animals at different time intervals anxiety yeast infection order effexor xr 75 mg visa. For multiple blood sampling anxiety symptoms 101 order effexor xr visa, inserting a cannula is recommended to reduce stress to the animals [31, 54]. Mass spectrometry is another technique that is used for quantifying the amount of drug in blood or plasma. The selection of an animal model depends on whether absorption, distribution, metabolism or excretion is being evaluated, which is greatly influenced by the physiological similarities and dissimilarities between the animal model and humans [9]. In vivo testing of orally delivered nanoparticles 469 Table 3 Suitable animal models for different pharmacokinetic studies. Pharmacokinetic parameter Animal model Reason References Absorption Dog Rat Distribution Rats and mice Metabolism Cynomolgus monkeys, rhesus monkeys, beagle dogs, pigs Excretion Cynomolgus monkeys and rats For drug molecule whose properties are pH dependent, as pH range in dogs are similar to humans Good correlation for colonic bioavailability (r2 ¼ 0. Can also provide information on drug-drug interaction Similar association between enzyme kinetics and activates. In addition, for organic anionic transporter 3 with cynomolgus monkey and human [56] [57] [57, 58] [57, 59] [57, 60] Therefore, the animal model selection should be done critically, to avoid any misleading results due to confounding factors from the model. Table 3 provides a brief overview of animal models that could be used based on the intended study. Vertebrate animal models are traditional models often used for studying oral nanoparticles, as they have higher significance for clinical translational [3]. The number of animals, biological sampling needed and the life cycle are important parameters when choosing animal models. In case of distribution and metabolism studies, the determinant factors are the expression of drug transporters and metabolizing enzymes, respectively [57, 61]. Renal blood flow, glomerular filtration rate, tubular secretion and reabsorption are important criteria for determining renal excretion, and must be 470 Nanotechnology for oral drug delivery considered if the drugs are excreted renally [57, 62]. Rats and mice are a good model for distribution, whereas the cynomolgus monkeys, rhesus monkeys, beagle dogs, pigs are better models for metabolism studies. As mentioned previously, rats have high correlation to humans in terms of intestinal permeability, thus making it one of the most widely used animal models to assess intestinal permeability. Mini pigs demonstrate other species that is commonly used to obtain t oral pharmacokinetic profiles of formulations. Guo et al used Bana mini-pigs for pharmacokinetic and pharmacodynamics evaluation of insulin from nanoparticles composed of amphiphilic chitosan and cell penetrating peptides [64]. Li and co-workers have used mice as a model to evaluate the biodistribution and excretion of mesoporous silica nanoparticles after oral administration [65]. The study demonstrated particle shaped dependent in vivo behavior, including absorption, distribution, excretion and toxicity. Compared to commercially available oral celecoxib formulation, the demonstrated celecoxib nanoparticles demonstrated faster onset of action and three-fold higher oral bioavailability. Chitosan based nanoparticles demonstrated enhanced bioavailability compared to other nanoparticles and commercially available Neoral microemulsion. The tissues can then be homogenized and used for different types of quantifications, such as of biomarkers, genes, nanoparticles or fluorescence. The semi quantification of nanoparticles is performed by dissolving the tissue and solubilizing it in a polymer for gel permeation chromatography. However, tissue homogenates have a high fluorescence background that could interfere with the final readouts. In vivo testing of orally delivered nanoparticles 471 In inflammatory bowel disease animal models, the colonic tissues are extracted and homogenized, and are used to quantify the cytokine levels or myeloperoxidase activity in the colon. The tissue extracts can also be used for other protein extracts, which can be quantified using western blotting, by comparing them to the relative amount of protein of similar molecular weight and standard. In another set of experiments, the tissues can also be used to visualize the presence of nanoparticles using fluorescence or confocal microscopy [1]. The biodistribution of these nanoparticles after oral administration was performed using fluorescence imaging of the collected organ/tissue at the end of the experiment. For example, spectroscopic and fluorescence imaging require the euthanization of animals and tissue extraction. Therefore, such methods only give information for specific time points, and a large number of animals are required for over-time analysis. Other techniques use radioactive labeling or fluorescent labeling to gather high definition images and real-time analysis after administration of the formulation. However, to acquire accurate results, organs and tissue can be extracted and analyzed separately. Technetium (99mTc) is the most common radioisotope used, as it has a short half-life (6 h) and a low radiation dose. Gamma scintigraphy has been extensively used for imaging in clinical applications [72, 73]. Additionally, the instability of the radiolabeling of nanoparticles can cause misleading results [74]. The images showed the specific and prolonged accumulation of the nanocomplexes in the intestinal mucosa, especially high at the cecum region, but there was no adherence to gastric mucosa [76]. Bioluminescent imaging allows detection of low levels of signal, as there is little background signals. On the other hand, fluorescent markers are available in wide varieties and are generally brighter than bioluminescence but the there is a relatively high background in vivo. This method provides important preclinical modality by repetitive and continuous monitoring of the molecular activities to gather information about disease progression or response to a given therapy. The technique utilizes the low bioluminescence of mammalian tissue that results in high signal to noise ratio [1, 78]. The nanoparticles present in the stomach where then continuously released to the intestinal lumen [76]. For inflammatory diseases, histological analysis can provide information regarding the inflammation, remission and/or healing of the intestinal tissues. In other cases, histology can provide information regarding the possible toxicity of the nanoparticles to the intestinal epithelial tissues. HematoxylinEosin (H&E) staining is the most commonly used staining used for intestinal tissues that helps to recognize different tissue types and identify morphological changes [81]. No histological abnormality was observed in the villus length, lamina propria, muscularis mucosae in the small intestine for all the nanoparticles treated animals. The effect of any change in the formulation or preparation process on the resultant bioavailability and possible therapeutic effect must be understood. This would determine the consistency in the quality of the manufactured batches over time. As the nanosystems get more complicated, predicting the in vivo performance will be even more challenging. The drug release from the nanoparticles provides critical information to gain insight for the in vivo performance of the formulation. However, to evaluate the release profile of drugs from nanoparticles in biorelevant media can pose further complications [83]. Furthermore, the unique reactive potential of nanoparticles can greatly affect the in vitro techniques such as toxicity studies, leading to data artifacts [84]. Thus, unavailability of adequately validated in vitro methods for predicting in vivo behavior is one of the major obstacle. The presence of several gaps in current methods, both in vitro and in vivo, greatly limits the potential of this approach [9]. Ethical considerations Ethical consideration in animal experimentation is one of the most important issues in scientific research. Millions of animals are used by scientists throughout the world to yield knowledge and advancements in biomedical research. The animal experiments are 476 Nanotechnology for oral drug delivery performed only after authorization from the respective ethical committee who decides if the experimental plan meets all the ethical demands and principles by the researcher who plans and executes the experimentations [86]. The scientific objective of the research should be clarified, by using a proper experimental design that allows reducing number of animals without compromising the statistical relevance and validity of the outcome. All the personnel and researchers must be trained in animal experimentation, which would allow them to refine the experimental procedures, and to reduce any pain and distress to the animal during the study. The experimental procedures must be designed by considering the wellbeing of the tested animals [86]. Overall, authorized and validated ethical guidelines must be followed during the planning and execution of the animal experiments. Animal research plays a great role in the advancements in the field of biomedical science. It also has significantly increased our understanding and knowledge of diseases, and its contribution to human health cannot be ignored. However, the use of animals in research has been the center of never-ending debate for many years around the world [87]. Antagonists of animal experimentation believe that such experiments are cruel and unnecessary. Nonetheless, it must also be considered that no scientist would want to inflict unnecessary harm and suffering to an animal in research. Thus, the animals in experiments are used under strict controls and only within accepted ethical framework. Complete replacement of such studies is not affordable as it can have severe consequences on medical research and human health. Therefore, it is very important for researchers to maximize their effort toward refinement and reduction. A healthy debate on use of animals in research can lead to constructive discussions to further improve the practice and reduce the number and suffering of animals. Conclusion the use of nanoparticles to improve the bioavailability and therapeutic efficiency of incorporated drug cargos has been increasing steeply. However, there are crucial gaps between the experimental designs and animal models for oral administration. The generalization of the use of animal models and experimental settings for a specific study should be avoided. Rather, they should only be selected after careful consideration of the drug cargo, type of nanoparticles and target disease [57]. The non-human nature of most of the models (healthy and disease) poses another major limitation for extrapolation of the therapeutic outcomes to clinical studies (human). Using various advanced techniques, a wide vista of information can be garnered from in vivo studies. Nevertheless, significant work is In vivo testing of orally delivered nanoparticles 477 still needed for developing animal experimentation that mimics the human clinical studies more closely. Overall, innovative and sophisticated in vivo animal models that encapsulate the features of human disease/disorder entirely would help in the advancement and enhance the success rates to clinical trials. The current status of exposure-driven approaches for chemical safety assessment: a cross-sector perspective. In vivo studies for drug development via oral delivery: challenges, animal models and techniques. Nanoparticles for oral delivery: targeted nanoparticles with peptidic ligands for oral protein delivery. Nanoparticulate drug delivery systems targeting inflammation for treatment of inflammatory bowel disease. The effects of food on the dissolution of poorly soluble drugs in human and in model small intestinal fluids. Why is it challenging to predict intestinal drug absorption and oral bioavailability in human using rat model. Are the available experimental models of type 2 diabetes appropriate for a gender perspective Pharmacokinetics in drug discovery: an exposure-centred approach to optimising and predicting drug efficacy and safety. Use of animal models of human disease for nonclinical safety assessment of novel pharmaceuticals. Enhanced oxidative stress and endothelial dysfunction in streptozotocin-diabetic rats exposed to fine particles. Oral delivery system prolongs blood circulation of docetaxel nanocapsules via lymphatic absorption. Thiolation and cell-penetrating peptide surface functionalization of porous silicon nanoparticles for oral delivery of insulin. Transepithelial transport of Fc-targeted nanoparticles by the neonatal fc receptor for oral delivery. Exendin-4 loaded nanoparticles with a lipid shell and aqueous core containing micelles for enhanced intestinal absorption. Development and in vivo evaluation of a new oral nanoparticulate dosage form for leuprolide based on polyacrylic acid. Administration of substances to laboratory animals: routes of administration and factors to consider. A spoonful of sugar helps the medicine go down: a novel technique to improve oral gavage in mice. Biodistribution, pharmacodynamics and pharmacokinetics of insulin analogues in a rat model: oral delivery using pH-Responsive nanoparticles vs. Enhancement of oral bioavailability of salmon calcitonin through chitosan-modified, dual drug-loaded nanoparticles. Preparation and characterization of solid lipid nanoparticles loaded with salmon calcitonin phospholipid complex. A comparative study of curcumin-loaded lipid-based nanocarriers in the treatment of inflammatory bowel disease.

Patients with this condition sound like they are intoxicated because their breathing and voice quality are irregular anxiety 1-10 rating scale cheap effexor xr 37.5 mg buy line, articulation overshoots and undershoots place targets anxiety 9gag order effexor xr 150 mg with visa, and their speech rate is slow anxiety disorder nos purchase 37.5 mg effexor xr mastercard. In addition to this kind of motor coordination anxiety knot in stomach order generic effexor xr on line, the cerebellum may play a role in motor planning and a disorder of motor planning anxiety 9 to 5 quality effexor xr 150 mg, apraxia of speech. This role is theorized because some of the symptoms of ataxic dysarthria and apraxia of speech overlap. For the mouth, the speech-language pathologist will ask the patient to say "pa-ta-ka" as fast as possible. Ataxic dysarthria Hypotonia Linguistic Function Growing evidence points to the cerebellum having an important modulating role in nonmotor, linguistic functions. Neuroimaging studies as well as cases of cerebellar-induced aphasia have contributed to the idea of a "linguistic cerebellum" (Mariën & Manto, 2015). Theorized language functions include assistance in the following: perception of speech/language, verbal working memory, verbal fluency, grammar processing, writing, and reading (Mariën et al. Select Disorders of the Cerebellum All cerebellar disorders are motor in nature (although, as mentioned, there are some cases of possible cerebellar-induced aphasia; see Mariën et al. Cerebellar Hemispheral Syndrome Cerebellar hemispheral syndrome can be caused by stroke, tumor, and multiple sclerosis. The syndrome primarily affects the ipsilateral limbs, causing tremor, dysmetria, and dysdiadochokinesia. Patients also experience the Holmes rebound phenomenon, which can be elicited by the patient holding out one of his or her arms while the examiner tries to push 126 Chapter 5 the Spinal Cord, Brainstem, Cranial Nerves, and Cerebellum down on it. Common causes include stroke, tumor, multiple sclerosis, and other degenerative disorders. The condition primarily affects the trunk muscles, causing unsteadiness, tremor, postural issues, and gait ataxia. Doctors at the hospital performed a computed tomography scan and discovered that she did not have a cerebellum. Though primary cerebellar agenesis is rare, other cases have been reported in the literature (Boyd, 2010; Glickstein, 1994). Friedreich Ataxia Friedreich ataxia is an inherited, progressive neurological disorder that follows an autosomal recessive inheritance pattern. Symptoms begin between the ages of 8 and 14 years and can include progressive muscle weakness in the limbs, loss of coordination, dysmetria, dysarthria, curvature of the spine, and vision and hearing issues. Most patients have cardiac issues (chronic myocarditis); as a result, the median age of death is 35 years. The answer is yes, and the rare condition is known as primary cerebellar agenesis. Yu, Jiang, Sun, and Zhang (2014) Following the course of this chapter is akin to tracing a tree up its trunk and through its branches. From the brainstem, branches called cranial nerves extend away from the brainstem and connect to head and neck structures. These nerves play a role in linking the cerebrum to the body by relaying either motor, sensory, special sensory, or parasympathetic information or some combination of the four. Many of these nerves are of concern to the speech-language pathologist and audiologist because they relay information related to articulation, voice, hearing, and swallowing. The pharyngeal phase of the swallow depends on another set of muscles to move food and liquid through the pharynx. List the cranial nerves involved in each of the following: speech, voice, swallowing, hearing. She is status post chemotherapy and bilateral mastectomy and is currently completing radiation therapy to the chest. Recently, she has been experiencing difficulty moving her tongue, which is affecting chewing, swallowing, and speech. Take one of the disorders in this chapter and write two to three pages about it including the following sections: cause, signs and symptoms, diagnosis, treatment, and speech/swallowing/hearing issues. Create a digital movie using your smartphone, teaching the class about reflexes and the reflex arc. Equal numbers of neuronal and nonneuronal cells make the human brain an isometrically scaled-up primate brain. Neural systems involved in fear inhibition: Extinction and conditioned inhibition. A new case of complete primary cerebellar agenesis: Clinical and imaging findings in a living patient. More specifically, we will learn about the thalamus, basal ganglia, and brain ventricles. The learner will list and briefly describe disorders associated with the diencephalon, basal ganglia, and brain ventricles. Introduction the Diencephalon · Thalamus · Subthalamus · Hypothalamus · Epithalamus the Basal Ganglia · Structure and Function of the Basal Ganglia · Internal Capsule and Corona Radiata · Basal Ganglia Disorders the Brain Ventricles · Structure and Function · Disorders of the Ventricles Conclusion Summary of Learning Objectives Key Terms Draw It to Know It Questions for Deeper Reflection Case Study Suggested Projects References 131 132 Chapter 6 Diencephalon, Basal Ganglia, and Brain Ventricles Introduction In this article, the diencephalon, basal ganglia, and brain ventricles will be explored. Special attention will be paid to what these structures might contribute to speech, language, and hearing. The Diencephalon the diencephalon is located between the cerebrum and the brainstem, resting above the midbrain of the brainstem. Its location makes it a prime area for connecting the cerebral cortex to the rest of the body. More specifically, the thalamus processes all sensory information (except olfaction), routing it to specialization cerebral cortex locations, which in turn process the particular type of sensory information. The thalamus is involved in motor function, but only indirectly through directing some extrapyramidal fibers, which control more autonomic functions, to the basal ganglia (Sherman, 2006; Webster, 1999). Structure and Function of the Thalamus the thalamus is made up of several different nuclei. We will now survey the thalamic nuclei, paying close attention to those involved with speech, language, or hearing. After processing this information, they project it to the prefrontal cortex and septal area. They also are involved in emotion and autonomic control (Castro, Merchut, Neafsey, & Wurster, 2002). These structures are involved in the limbic system, where emotional processing takes place (Webster, 1999). The pulvinar nucleus (P), the largest nucleus in the thalamus, receives input from the superior colliculus and projects to the secondary visual cortex (areas 18 and 19). The spinothalamic tract transmits pain, temperature, and crude touch information from the body to the thalamus. The final two nuclei in this grouping are sometimes classified under lateral ventral nuclei, as we have done here, or sometimes grouped together under the metathalamus (meta is Greek for "after"). The mammillary bodies receive input from the amygdala and hippocampus, which are part of the limbic system, and then project to another limbic structure, the cingulate cortex. Intralaminar Nuclei There are two intralaminar nuclei of the thalamus, the centromedian intralaminar nucleus and the parafascicular intralaminar nucleus. These nuclei receive input from the reticular formation and other thalamic nuclei and project to the basal ganglia and numerous places in the cerebral cortex. Reticular Nuclei the reticular nuclei receive input from the cerebral cortex, basal ganglia, and other thalamic nuclei but do the Diencephalon 135 not project information to the cerebral cortex. Rather, they make connections to other thalamic nuclei and the basal ganglia (Webster, 1999). Kandel, Schwartz, Jessell, Siegelbaum, and Hudspeth (2013) report that the reticular nuclei monitor all the information between the cerebral cortex and the thalamus and act as a filter for information ascending to the cortex. Midline Nuclei these nuclei are interconnected with the amygdala, cingulate gyrus, and hypothalamus. Their function is not well understood, but they may facilitate emotional processing. Thalamic Disorders In addition to being a relay station, the thalamus also plays a role in the perception of pain, regulation of cortical arousal, and control of the sleep­wake cycle A (Sherman, 2006). The thalamus receives projections from multiple ascending sensory pathways, including pathways for pain (Ab Aziz & Ahmad, 2006). Damage to the thalamus can result in thalamic pain syndrome, which is also known as Dejerine-Roussy syndrome. This condition involves burning or tingling sensations and possibly hypersensitivity to stimuli that would not normally be painful, such as light touch or temperature change. Damage to specific thalamic regions associated with these fibers can result in disorders of consciousness, such as coma, excessive daytime sleepiness. Johnson and Ojemann (2000) have proposed that the dominant ventrolateral thalamus (the left ventrolateral thalamus in most people) plays an important role in language and coordinating the cognitive and motor aspects of language. Using electrical stimulation to this area, they were able to induce misnaming and perseverations as well as articulation errors. Crosson (1984) described what is now called thalamic aphasia, a type of aphasia noted to have three main characteristics. The first is fluent verbal output with semantic paraphasias that often results in jargon. It is obviously different from Wernicke aphasia, in which patients are fluent with paraphasias but have significantly impaired auditory comprehension and repetition. It is also different from transcortical sensory aphasia, which involves significantly impaired auditory comprehension with fluent, neologism-filled speech and preserved but echolalic repetition. The occurrence of thalamic aphasia suggests that subcortical structures, such as the thalamus, along with the cerebral cortex play an important role in language. The hypothalamus does not appear to play any direct role in speech, language, or hearing, but it may play an indirect role in regulating some substances that be involved in neurotransmitter function, which in turn may affect disorders such as dyslexia, aphasia, and developmental speech delay (Kurup & Kurup, 2003). Subthalamus Given its name, the subthalamus obviously lies below the thalamus; it contains a set of specialized cells called the subthalamic nucleus. Functionally, it has more in common with the basal ganglia than with the thalamus. Damage to the subthalamus can result in motor problems like hemiballismus, which is a one-sided involuntary flinging of the limbs sometimes seen in Parkinson disease or other neurological diseases (Das, Romero, & Mandel, 2005). Subthalamic damage may also play a role in obsessive-compulsive disorder and general impulsivity (Carter, 2009; Frank, Samanta, Moustafa, & Sherman, 2007; Mallet et al. Deep brain stimulation of the subthalamus has been shown to relieve some types of tremors and other Epithalamus the epithalamus lies superior and posterior to the thalamus. It is about the size and shape of a grain of rice, being about 5 to 8 millimeters in size. It produces a hormone known as melatonin, which is involved in regulating the sleep­wake cycle, as well as our circadian rhythms, and in gonad development. It has been shown to be effective for treating chronic pain as well as tremors and other involuntary movements. The procedure has brought relief to patients with many different diagnoses, including Parkinson disease and Huntington disease. Some advantages of the procedure are (1) it can be done on both sides of the brain to control symptoms affecting both sides of the body, (2) its effects are reversible, and (3) it can control symptoms on a continuous 24-hour basis. Some risks include cerebral hemorrhage, cerebrospinal fluid leaking, or an infection at the surgical site. It is involved in olfactory reflexes, such as when we salivate at the smell of food. The habenula is also involved in stress responses due to connections to the limbic system as well as our reward processing system (Andres, Düring, & Veh, 1999; Matsumoto & Hikosaka, 2008). The stria medullaris, a white matter tract, connects the habenular nuclei to the limbic system (Swenson, 2006). The famous philosopher René Descartes believed the pineal gland was the seat of the soul. Structure and Function of the Basal Ganglia the basal ganglia are a group of structures that make up most of the remaining subcortical gray matter regions of the brain. The globus pallidus (Latin for "pale globe") and putamen (Latin for "shell") reside together but are separate from the caudate nucleus. It has a bulbous head anteriorly and a thin tail that leads into a second bulge, the amygdala (part of the limbic system). The caudate is separated from the globus pallidus and putamen by the internal capsule. The basal ganglia also have many connections to the cerebral cortex, but their connections to cortical motor areas are the most significant. LaPointe and Murdoch (2014) suggest two categories: dyskinesias, which are involuntary movements, and akinesias, which are involuntary postures. The category of dyskinesias include tremors (rhythmic shaking), athetosis (slow, writhing movements of the head and hands), chorea (quick, abrupt fidgeting of the hands and/or feet), ballismus (quick flinging of a limb), and tics (quick, stereotyped motor or vocal behaviors). In contrast, akinesias include rigidity (limb resistance to passive movement), dystonia (simultaneous agonist and antagonist muscle contraction resulting in distorted movements and postures), and bradykinesia (slow movements). Patients with basal ganglia damage can have both dyskinesias and akinesias at the same time. For example, the three hallmark characteristics of Parkinson disease include two akinesias (bradykinesia and rigidity) and one dyskinesia (tremor). Another example is Huntington disease, which typically has one dyskinesia (chorea) and one akinesia (dystonia). The exact etiology of the condition is unknown, but there is evidence through twin studies that it may be inherited. The symptoms of the disease are sometimes the worst in adolescence and improve as the person ages. Motor tics can involve behaviors like eye blinking, facial grimacing, or sudden jerks of the head. Internal Capsule and Corona Radiata Almost all sensory information is relayed through the thalamus with the exception of olfaction, which has its own pathway via the olfactory bulbs. Much cerebral activity takes place in this dense white matter area because disorders involving it result in significant deficits in cognitive, social, and emotional abilities.

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