Carmen B. Smith, PharmD, BCPS

• Assistant ProfessorﾗPharmacy Practice, Division of Acute Care Pharmacy, St. Louis College of Pharmacy, St. Louis, Missouri

https://www.stlcop.edu/directory/employee/carmen-smith

Pregnancy rates for patients with corrected transverse septa range from 25% to 50% based on location of the septum and series report prostate spet-085 hair loss order 0.4 mg flomax with visa. Pregnancy success following surgical correction of imperforate hymen and complete transverse vaginal septum prostate cancer laser surgery 0.2 mg flomax order otc. The diagnosis and management of the imperforate vaginal membrane in the pre-pubertal child prostate cancer 100 psi flomax 0.4 mg purchase without prescription. Pregnancy success is greatest with septa that are lower in the vagina and repaired early mens health 062012 buy discount flomax 0.4 mg. Possible Complications: Mechanical irritation or interference with intercourse or childbirth (rare) man health in today 0.2 mg flomax buy otc, infection (rare). Expected Outcome: Some care must be used in the excision of large cysts so that vaginal scarring and stenosis do not occur; otherwise, surgical therapy should be successful. Special Tests: Vaginal adenosis may be excluded by staining with Lugol solution (adenosis will not stain). Specific Measures: Surgical excision if the mass is symptomatic or its cause is uncertain; otherwise, no therapy is required. Possible Complications: Vaginal lacerations and secondary infection, vulvar excoriations, sexual dysfunction. Expected Outcome: Generally good results with topical or systemic therapy for estrogen loss. Drug(s) of Choice · Estrogen replacement therapy when appropriate (see "Menopause") · Water-soluble lubricants for intercourse · Long-acting emollients (Replens, etc. Precautions: Petroleum-based products (eg, Vaseline) are difficult to remove and may lead to additional irritation. Replens versus dienoestrol cream in the symptomatic treatment of vaginal atrophy in postmenopausal women. Urinary tract infections in postmenopausal women: effect of hormone therapy and risk factors. Diagnostic Procedures: History and physical examination (history is often misleading or false). Prevention/Avoidance: Avoidance of alcohol or drug use, careful consensual intercourse, adequate vaginal lubrication. Expected Outcome: Generally good healing; the risk of recurrence is based on cause. Pathologic Findings the most common site of coital laceration is the posterior fornix, followed by the right and left fornices. Specific Measures: Surgical closure of the laceration, evaluation of the integrity of the urinary and gastrointestinal tracts; may include exploratory laparotomy or laparoscopy in cases of evisceration or peritoneal breach. Activity: Pelvic rest (no tampons, douches, or intercourse) until healing has occurred. Primary repair of obstetric anal sphincter laceration: a randomized trial of two surgical techniques. Healing of hymenal injuries in prepubertal and adolescent girls: a descriptive study. Drug(s) of Choice Estrogen replacement therapy (for postmenopausal patients) improves tissue tone and healing and is often prescribed before surgical repair or as an adjunct to pessary therapy. Contraindications: Estrogen therapy should not be used if undiagnosed vaginal bleeding is present. Possible Complications: Thickening or ulceration of vaginal tissues, urinary incontinence, kinking of the ureters, and obstipation. Complications of surgical repair include intraoperative hemorrhage, nerve damage (sciatic), damage to the rectum or uterus, postoperative infection, and complications of anesthesia. The placement of a surgical mesh carries the risk for both acute and delayed complications and should be reserved for selected patients. If uncorrected, complete prolapse is associated with vaginal skin changes, ulceration, and bleeding. Porcine skin collagen implants to prevent anterior vaginal wall prolapse recurrence: a multicenter, randomized study. Costs of ambulatory care related to female pelvic floor disorders in the United States. This does not avoid systemic estrogen absorption, which may actually be increased in the presence of significant atrophy (see below). Contraindications (Systemic Therapy): Active liver disease, carcinoma of the breast (current), chronic liver damage (impaired function), known sensitivity to topical vehicles, endometrial carcinoma (current), recent thrombosis (with or without emboli), unexplained vaginal bleeding. Precautions: Up to 25% of estrogen placed in the vagina may be absorbed into the circulation. Continuous estrogen exposure without periodic or concomitant progestins increases the risk of endometrial carcinoma by 6­8-fold when the uterus is present. Systemic side effects (hot flashes, increased risk of thromboembolism) and the need for daily dosing limit use of this therapy to selected patients. Possible Complications: Reduced resistance to infection, dyspareunia, and traumatic injury during intercourse. Efficacy of low-dose estradiol vaginal tablets in the treatment of atrophic vaginitis: a randomized controlled trial. Vaginal pH-balanced gel for the control of atrophic vaginitis among breast cancer survivors: a randomized controlled trial. Low dose of transdermal estradiol gel for treatment of symptomatic postmenopausal women: a randomized controlled trial. Efficacy and tolerability of a novel estradiol vaginal ring for relief of menopausal symptoms. Menopausal symptoms in older women and the effects of treatment with hormone therapy. Drug(s) of Choice · Oral-metronidazole (Flagyl, Protostat) 500 mg twice daily for 7 days (90%­100% cure), oral ampicillin 500 mg every 6 hours for 7 days. Contraindications: Metronidazole is relatively contraindicated in the first trimester of pregnancy. Precautions: Oral metronidazole is associated with the potential for systemic side effects, including a metallic taste in the mouth and stomach upset. Topical metronidazole is currently available in two forms: one for dermatologic use and one for intravaginal use. The pH of these two preparations is quite different, making it important to specify the form on the prescription to avoid significant chemical irritation. Some concerns have been raised about the risk of inducing antibiotic resistance through the use of topical clindamycin, although the clinical significance is uncertain. Interactions: Because of a disulfiram-like reaction, patients must be warned to avoid alcohol intake during metronidazole therapy. Alternative Drugs · Oral-tetracycline 250­500 mg twice a day for 7 days, clindamycin 300­450 mg every 6 hours for 7 days. Tinidazole is a secondgeneration nitroimidazole that is considered as an alternative regimen. Workup and Evaluation Laboratory: Culture or monoclonal antibody staining may be obtained to evaluate other causes but are seldom necessary. Diagnostic Procedures: Physical examination, microscopic examination of vaginal secretions in normal saline. For bacterial vaginosis, the diagnosis requires three of the following (Amsel criteria): homogeneous discharge, pH 5­5. Prevention/Avoidance: Bacterial vaginosis is considered to develop 5­10 days after exposure to the involved bacteria. Gardnerella may be found in 90% of male partners of women with bacterial vaginosis. Hence, sexual transmission is postulated, although Pathologic Findings Increased white blood cells and number of bacteria when vaginal secretions are viewed under normal saline suggest vaginitis. For bacterial vaginosis, clue cells must represent 20% or more of epithelial cells seen. Increased risk of upper genital tract infections and postoperative infections if surgery is performed while bacterial vaginosis is present. Increased risk of premature delivery, premature rupture of the membranes, and chorioamnionitis when bacterial vaginosis is present during pregnancy. Expected Outcome: Most treatment failures are actually caused by reinfection or failure to comply with treatment. Intravaginal metronidazole gel versus metronidazole plus nystatin ovules for bacterial vaginosis: a randomized controlled trial. Prevalence of bacterial vaginosis: 2001-2004 National Health and Nutrition Examination Survey data. The effects of antimicrobial therapy on bacterial vaginosis in non-pregnant women. Antibiotics for bacterial vaginosis or Trichomonas vaginalis in pregnancy: a systematic review. Natural history of bacterial vaginosis and intermediate flora in pregnancy and effect of oral clindamycin. Interactions: Oral fluconazole should be used with caution in patients taking oral hypoglycemics, coumarin-type anticoagulants, phenytoin, cyclosporine, rifampin, or theophylline. Alternative Drugs Povidone iodine (topical), gentian violet (1%), and boric acid (600-mg capsules placed high in the vagina twice daily; can be fatal if swallowed). Prevention/Avoidance: Good perineal hygiene, clothing and activities that allow perineal ventilation (cotton underwear, loose clothing). Possible Complications: Vulvar excoriation caused by scratching, chronic vulvitis, secondary vaginal or vulvar infections. Expected Outcome: A small number (<5%) of fungal infections are resistant to imidazole therapy and an increasing number of cases of fluconazole resistance have been reported. Approximately 30% of patients experience a recurrence of symptoms within a month (related to a continuing exposure, a change in host defenses [such as altered cellular immunity], or the ability of the fungus to burrow beneath the epithelium of the vagina). Pathologic Findings Branching and budding of vaginal monilia distinguish monilial vaginitis from lint or other foreign material. The use of fluconazole has been associated with an increased risk of early pregnancy loss. Association between use of oral fluconazole during pregnancy and risk of spontaneous abortion and stillbirth. Oral versus intra-vaginal imidazole and triazole anti-fungal treatment of uncomplicated vulvovaginal candidiasis (thrush). Most treatment failures are actually caused by reinfection or failure to comply with treatment. Increased frequency of Pap tests until the abnormality is resolved or further diagnosis is established (for a follow-up Pap test result to be "negative," it must have normal or benign findings, but it also must be "satisfactory for interpretation"). Cone biopsy, hysteroscopy, or both may be required to adequately evaluate these patients. If only low-risk serotypes are found, normal schedules for cervical cytology may be followed. Possible Complications: Progression to more severe squamous abnormalities or occult disease unless a diagnosis is established and treatment is instituted. If low-risk serotypes are the only finding, a repeat cervical cytology (Pap test) should be performed in 12 months. Results of a randomized trial on the management of cytology interpretations of atypical squamous cells of undetermined significance. A randomized trial on the management of low-grade squamous intraepithelial lesion cytology interpretations. Relationship of atypical glandular cell cytology, age, and human papillomavirus detection to cervical and endometrial cancer risks. Atypical squamous cells of undetermined significance in liquid-based cytologic specimens: results of reflex human papillomavirus testing and histologic follow-up in routine practice with comparison of interpretive and probabilistic reporting methods. Prevalence: Less than 5% of Pap tests for low-grade abnormalities and 2% for high-grade abnormalities. Increased frequency of Pap tests until the abnormality is resolved or further diagnosis is established (for a follow-up Pap test to be "negative," it must have normal or benign findings, but it also must be "satisfactory for interpretation"). If colposcopy is adequate and the histologic abnormality found is mild, obtaining follow-up Pap tests at 6-month intervals for 2 years or three normal tests is suitable. Treatment must be based on an accurate diagnosis and the extent of the lesion involved. Drug(s) of Choice Based on specific indications, most therapy is surgical or ablative in nature. If colposcopy is inadequate to delineate lesions present or the entire transformation zone cannot be seen, diagnostic conization may be needed. Expected Outcome: Of patients with these findings, 60% or more undergo spontaneous regression of the underlying process, resulting in a return to normal Pap test results. Pathologic Findings Acetowhite areas on colposcopy, early vascular changes leading to mosaicism and punctation. Microscopic-loss of normal maturation, increased nuclear/cytoplasmic ratio, nuclear atypia (mild). Feasibility of management of high-grade cervical lesions in a single visit: a randomized controlled trial. Human papillomavirus testing and molecular markers of cervical dysplasia and carcinoma. This change is generally associated either spatially or temporally with invasive carcinoma. Untreated disease is anticipated to progress to invasive carcinoma over the course of 12­86 months in 15%­40% of patients. Special Tests: Colposcopy, colposcopically directed biopsy, and endocervical curettage.

Most are electron-dense with a pale halo; one appears to be fusing with the plasma membrane prior to exocytosis androgen hormone joint cheap 0.4 mg flomax mastercard. It helps elucidate intracellular pathways in synthesis and secretion of insulin and discharge of this peptide hormone by exocytosis into circulation prostate needle biopsy generic flomax 0.4 mg mastercard. Distinctive membranebound secretory vesicles prostate cancer forums message boards buy cheap flomax 0.2 mg on-line, which derive from the Golgi complex mens health 042013 0.2 mg flomax order with amex, dominate the cytoplasm mens health bodyweight workout cheap flomax 0.2 mg visa, usually between the ovoid nucleus of the cell and the plasma membrane, which abuts a fenestrated capillary. Vesicle morphology differs markedly among species and among other islet cell types, but secretory vesicles in human beta cells, about 200-250 nm in diameter, typically have an electron-dense crystalloid composed of an insulin­zinc complex surrounded by pale matrix and enclosed by a loosely fitting membrane. A subsequent increase in intracellular Ca2+ stimulates rapid exocytotic release of insulin into adjacent fenestrated capillaries to ultimately affect cell receptors in peripheral target tissues (mostly skeletal muscle, liver, and adipose tissue). Glandular architecture shows many closely packed parenchymal cells arranged in ill-defined lobules (dashed circle). Intervening stroma, which supports the parenchyma, contains several enlarged, thin-walled capillaries (Cap) and a venule (*). Groups of pinealocytes (arrows) with euchromatic nuclei and prominent nucleoli are mingled with smaller, dark glial cells. Intervening areas contain delicate connective tissue stroma and a network of capillaries (Cap). These round cells with pale nuclei have accumulations of golden brown pigment-lipofuscin-in the cytoplasm. It is divided into poorly defined lobules by delicate connective tissue septa that extend inward from the capsule formed around the gland by pia mater. The pineal has a mostly glandular architecture and consists mainly of closely packed, pale cells-pinealocytes-forming cords or clusters. Pinealocytes are the source of the hormone melatonin, which is released from long terminal cell expansions into closely associated fenestrated capillaries. This hormone exerts powerful effects on circadian rhythms and in some species regulates reproduction. After puberty, mineralized extracellular concretions, called corpora aranacea (brain sand), are a salient feature. They increase with age and, because of radiopacity, are a useful radiologic midline marker for clinicians. The precise functions of the human pineal remain unclear, but evidence exists that fluctuations in melatonin secretion regulate the diurnal rhythm, related to darkness and light, of other endocrine glands. The pineal may also control gonadal development before puberty via the hypothalamic-pituitary axis by suppressing growth hormone and gonadotropin. Also, use of melatonin may help counteract drowsiness and disorientation related to jet lag. Dilated colloid-filled follicles (*) vary dramatically in size and are lined by cuboidal or flattened follicular cells. In some areas, follicles are smaller and more closely packed and exhibit follicular hyperplasia accompanied by surrounding connective tissue fibrosis. Hyperthyroidism leads to many thyroid diseases; the most common being exophthalmic goiter (Graves disease). Histologically, the enlarged gland contains highly infolded follicles lined by high cuboidal epithelium. This causes recurrent episodes of hypertrophy and hyperplasia of follicular cells ultimately leading to irregular enlargement of the gland. Resultant swelling of the neck may lead to potential tracheal airway obstruction and other complications. At least 90% of those affected are women, and these goiters frequently occur during adolescence and pregnancy. Goiters are treated according to underlying cause and degree of glandular enlargement. If the thyroid is producing an excess of T3 and T4 hormones, radioactive iodine therapy is recommended to reduce the size of the gland; when goiter is due to iodine deficiency, small doses of iodide medication may be prescribed; whereas goiter associated with an underactive thyroid is treated by hormone replacement with levothyroxine. At mucocutaneous junctions, skin is continuous with mucous membranes lining digestive, respiratory, and urogenital tracts. It consists of stratified squamous keratinized epithelium on its outer part, called the epidermis, and an inner layer of fibrous connective tissue, called the dermis. A loose layer of subcutaneous connective tissue, the hypodermis, attaches skin to underlying structures and permits movement over most body parts. Skin has a dual embryologic origin: Epidermis and its appendages derive mostly from surface ectoderm; dermis originates from mesoderm. The epidermis consists primarily of cells called keratinocytes, which make up more than 90% of the cell population. Other epidermal cells are melanocytes and Merkel cells, which derive from neural crest, and Langerhans cells, which have a monocytic origin. During embryonic development, skin appendages deriving from the epidermis grow down into the dermis. First-degree (or superficial) burns are limited to epidermis, in which the skin presents with erythema and may peel; mild sunburn is a common example. Second-degree (or partial-thickness) burns, often caused by scalding, extend into deep (reticular) dermis, leading to inflammation, severe pain, and blister formation with little likelihood of scarring. In this case, even when most of the epithelium is destroyed, healing typically takes 1-3 weeks because of regeneration via epithelial cells surrounding hair follicles and sweat glands. More serious thirddegree (or full-thickness) burns extend through the entire dermis with severe damage that may reach deeper subcutaneous layers. Because these burns are so deep, they cause little or no pain because of destruction of nerves and nerve endings. The interface between the thick, keratinized epidermis and underlying, lightly stained dermis is highly convoluted. A thinner epidermis (Ep) overlies the dermis (De), which consists of strands of dense connective tissue fibers. Thick skin, which is glabrous, is found on palms of the hands and soles of the feet; thin skin covers most of the remaining body surface. The junction between the avascular epidermis and richly vascularized dermis-the dermoepidermal border-is usually highly corrugated and has many downward, ridge-like extensions of epidermis, called epidermal, or rete, ridges that project between alternating, upward projections of dermis, the dermal papillae. The contour of this border resembles the undersurface of an egg carton and is more complex in thick than in thin skin. Aside from fibroblasts, other connective tissue cells in the dermis include macrophages, mast cells, adipocytes, plasma cells, and lymphocytes. The three major types are basal cell carcinoma and squamous cell carcinoma (arise from keratinocytes) and melanoma (originates from melanocytes). Basal cell carcinoma accounts for more than 90% of all skin cancers; it grows slowly and seldom spreads to other parts of the body. Squamous cell carcinoma is associated with long-term exposure to sun and has a greater likelihood of metastasis. If it is diagnosed early, treatment is usually effective; melanoma diagnosed at a late stage is more likely to metastasize and cause death. A dermal papilla that projects superficially into the epidermal region consists of loose connective tissue of the papillary layer. The epidermis, a continually renewing epithelium, shows progressive differentiation and keratinization in a basal to superficial direction. The stratum basale, or germinativum, is the deepest; it consists of a single layer of closely packed, basophilic cuboidal to columnar epithelial cells, known as keratinocytes, resting on a basement membrane. These cells have oval nuclei that often show mitotic figures; they continuously undergo cell division to replace cells that move outward through the epidermis. The next layer, the stratum spinosum, is several cells thick and has polyhedral cells that become progressively flatter toward the surface. Cell shrinkage caused by a fixation artifact accentuates the processes and creates spines or prickles-thus the name prickle cells. The next layer, the stratum granulosum, consists of three to five layers of flattened cells, their axes aligned parallel to the epidermal surface. Superficial to this layer is a thin, translucent, lightly eosinophilic layer, known as the stratum lucidum. Absent in thin skin but present in thick skin, it consists of a few layers of tightly packed squamous cells that lack organelles and nuclei. The outermost layer, the stratum corneum, is made of dead, anucleate cornified cells; its thickness varies regionally. The most superficial cells are continuously shed in a process known as desquamation. Leukoderma associated with inflammatory disorders of the skin, such as atopic dermatitis, and vitiligo are two more common hypopigmentation disorders. It is seen primarily, but not only, in women; its onset may be during pregnancy, so it is also called mask of pregnancy. Exposure to the sun is important in induction and maintenance of hyperpigmented areas of the face. Keratinocytes in the basal layer (below) are cuboidal, whereas those on the free surface (above) are squamous and covered by keratin. Cytoplasm of cells in the stratum granulosum has tonofilaments but few organelles. Small, round lamellar bodies (arrows) contain glycolipid that is eventually released between the cells and creates a waterproof permeability barrier. Interlocking cells of the stratum corneum are flattened scales, devoid of organelles, but densely packed with tonofilaments. In the stratum granulosum, almost all cytoplasmic organelles and nuclei disappear because of lysosomal enzyme activity. The residual cellular profiles are filled with tightly packed filaments and are enclosed by a thickened cell membrane-the horny cell membrane. Round to oval membrane-bound granules in keratinocytes in upper layers- the lamellar bodies-are 300-500 nm in diameter, are derived from Golgi complex, and are rich in glycolipids. They are eventually released from and deposited between keratinocytes, most likely forming an intercellular barrier to water. Unique keratin packing probably accounts for the presence of a stratum lucidum in plantar and palmar skin. The stratum corneum is made of interlocking cells arranged in orderly vertical stacks. These cells have thickened cell membranes and lack desmosomes, which allows cells to dissociate and desquamate easily. The normal time for turnover of keratinocytes from stratum basale to uppermost stratum corneum varies from 20 to 75 days. Turnover and transit times may be even more rapid in some diseases, such as psoriasis, in which transit time is about 8 days. A keratinocyte in the stratum basale contains an elongated nucleus with euchromatin and heterochromatin. Keratin-containing tonofilaments, organized into tightly packed bundles, are seen throughout the cytoplasm and insert into desmosomes (circles) linking adjacent keratinocytes. Basal aspects of the cells contain numerous hemidesmosomes (arrows) that attach to underlying basement membrane. A central core region that bridges the gap between cells separates two identical electron-dense plaques. Tonofilaments (keratin) of the cytoskeleton are associated with these cytoplasmic plaque regions. Their cytoplasm contains many ribosomes, mitochondria, and an extensive cytoskeleton of 10-nm intermediate filaments known as tonofilaments. All epithelial cells contain keratins, and almost 50 different types of keratins are found in skin. These complex intercellular junctions mediate and enhance cell adhesion by anchoring keratin filaments to keratinocyte plasma membranes. By linking tonofilament bundles of adjacent cells, desmosomes provide the epidermis with structural continuity and mechanical strength. To further counteract mechanical forces, basal aspects of keratinocytes are firmly attached to underlying basement membrane by hemidesmosomes. Hemidesmosomes have only one intracytoplasmic attachment plaque to which tonofilaments from the cell interior attach. Fine anchoring filaments radiate from the outer aspect of the plasma membrane into the basal lamina. The basement membrane at the dermoepidermal junction usually requires special light microscopic techniques to be visible. This specialized supporting zone of extracellular matrix consists of several layers. A deeper reticular lamina, made mainly of type I collagen fibers, merges with underlying connective tissue. Antigens for these diseases are components of either desmosomes or hemidesmosomes and belong to three genetic families-cadherin, armadillo, and plakin. Autoantibodies may react with the keratinocyte cell surface or epidermal basement membrane, which induces separation of epidermal keratinocytes or dermoepidermal junctions. Pemphigus is the most common disease with anti-keratinocyte cell surface antibodies; the related bullous pemphigoid causes subepidermal blisters. In these diseases, mutations in genes encoding desmosomal components have been identified, which may lead to novel, efficient treatment strategies. They are recognizable by an intrinsic color and content of brown granular deposits of melanin. In most routine tissue preparations and in paler skin, however, melanocytes are usually clear cells in the basal epidermis. Irregular pigmentation, asymmetrical contour, and uneven border characterize this skin lesion. Above, Melan-A, an antibody to melanin, is immunolocalized in melanocytes (arrows) and reveals their dendritic processes. The major determinant of color is not melanocyte number but activity, which is affected by corticotropin from the pituitary. Derived from the neural crest, melanocytes migrate to the basal layer of the epidermis and hair matrices as early as 8 weeks in the embryo, and to eyes, ears, and brain meninges.

Instead of being linked by desmosomes prostate neoplasm cheap flomax 0.4 mg, each melanocyte establishes contact via dendritic processes with about 30 nearby keratinocytes mens health 7 day workout plan flomax 0.2 mg buy without a prescription. Melanosomes are pinched off into keratinocyte cytoplasm mens health zac efron photoshop generic flomax 0.4 mg buy online, where they are often packaged in secondary lysosomes prostate pain after ejactulation order 0.4 mg flomax otc. Two major forms of melanin are found in humans prostate cancer dogs order flomax cheap, eumelanin, which is brown to black, and pheomelanin, which is yellow to red; both are derived from tyrosine. It is caused by genetic and environmental factors, most frequently after intermittent exposure to sun. Most develop from melanocytes in the skin and some in the mucous membranes, uvea of the eye, and meninges. Melanocyte transformation to melanoma is via radial and vertical growth phases: melanocyte proliferation forming nevi with subsequent dysplasia, hyperplasia, invasion, and metastasis. Treatment is surgery, sometimes followed by sentinel lymphadenectomy and adjuvant interferon alfa-2b therapy. Melanocytes in this location are similar in many respects to those in epidermis except they are not in direct contact with keratinocytes. The irregular borders of these cells have many filopodia (arrows), which contain an extensive cytoskeletal network. Numerous electron-dense melanosomes (*), differing in size and shape, are seen throughout the cytoplasm. Mature membrane-bound melanosomes (*) show a homogeneous, electron-dense core, and vary in size and shape; some are rounded and others are more elliptical. They have concentric internal lamellae and give rise to round melanosomes (Me), which contain melanin. By electron microscopy, melanocyte cytoplasm contains a prominent juxtanuclear Golgi complex, moderate amounts of rough endoplasmic reticulum, many mitochondria, and scattered free ribosomes. Distinctive membrane-bound melanosomes, which derive from the Golgi complex, dominate the cytoplasm. They usually cluster near cell centers and can rapidly redistribute along microtubules and actin filaments to filopodia at ends of dendritic processes. Such a filopodial-mediated melanosome transfer is a unique and dynamic mechanism controlled by various autocrine and paracrine factors. Langerhans cells are not well seen with conventional H&E staining and thus require special stains for positive identification. Above: the section passes through a small lobe of the nucleus, which in most cells is large and infolded. Each has a pentalaminar rod-shaped region (about 50 nm in diameter) attached to a clear vesicle at one or both ends. They are most common in superficial layers of the stratum spinosum and stratum granulosum of epidermis and are also abundant in mucosal stratified squamous epithelium of oral and genitourinary regions, including vagina, ectocervix, rectum, and male foreskin. Langerhans cells form a tight, intercommunicating network with each other and with adjacent keratinocytes via the cell adhesion molecule-E-cadherin. Similar to melanocytes, they are not linked by desmosomes to adjacent keratinocytes and possess slender dendritic processes emanating from a spherical cell body. Their cytoplasm contains the usual organelles, including a well-developed Golgi complex and lysosomes. They also have unique cytoplasmic inclusions known as Birbeck granules, which look like tennis rackets and are best resolved by electron microscopy. These consist of superimposed, zippered pentalaminar membranes that contain langerin and are thought to be infoldings of cell membrane, possibly a result of antigen processing. They also contain clathrin, similar to that in coated pits of other cells, which suggests a role in receptor-mediated processing and recognition. Clinical manifestations range from benign, single-organ disease to life-threatening multiorgan dysfunction. The number of Langerhans cells increases in various inflammatory conditions, such as contact dermatitis, allergic rhinitis, and psoriasis, in which these cells are believed to play immunosuppressive roles. Papillary loops of dermal papillae Epidermis Papillary dermis Superficial plexus Reticular dermis Deep dermal plexus Epidermis Dermis Schematic of epidermis and papillary layer of dermis. The papillary dermis is loose connective tissue with collagen fibers (Co) interspersed with mononuclear cells. Capillaries (Cap) form loops that extend into dermal papillae and are derived from the horizontal superficial plexus of arterioles. The three-dimensional organization of the papillae has been likened to a candelabra, with the loops representing candles. This short, coiled vascular shunt consists of the terminal segment of an arteriole (A) directly connected to a venule (V) with no intervening capillary network. Condensed connective tissue with bundles of collagen fibers (Co) encapsulates the glomus body. Large muscular arteries that supply skin are found in subcutaneous connective tissue and are accompanied by muscular veins. They branch, anastomose, and form a network that runs parallel with the skin surface. Smaller arteries, veins, and capillaries constitute the main vasculature in the dermis. Networks of these small vessels form deep plexuses in the reticular dermis and superficial plexuses in the papillary dermis, which are connected by communicating vessels. A subepidermal network of arterioles immediately under dermal papillae supplies blood to capillary loops in each papilla. An extensive network of capillaries immediately under the epidermis supplies nutrients to the avascular epithelium. Capillaries also surround the matrix of hair follicles and are closely associated with sweat and sebaceous glands. Many arteriovenous anastomoses in deeper layers of the dermis, especially in the dermis of fingers, lips, and toes, are direct connections between arterioles and venules and lack an intervening capillary network. At the arteriole end, these vascular shunts are coiled and surrounded by a row of modified smooth muscle cells serving as sphincters. These specialized structures, known as glomus bodies, play a role in peripheral temperature regulation. They are under autonomic vasomotor control and divert blood from the superficial to the deep plexus to reduce heat loss. Lymphatics of skin accompany venules and are also located in deep and superficial plexuses. Surrounding dermal connective tissue contains irregular coarse bundles of collagen fibers (Co) interspersed with many small blood vessels and capillaries (Cap). Intervening spaces contain amorphous extracellular matrix that is rich in glycosaminoglycans and dermatan sulfate. This small, encapsulated tactile receptor is located at the undersurface of epidermis (Ep), and consists of tightly coiled unmyelinated nerve terminals. This large, encapsulated receptor responds to deep pressure and transient vibratory stimuli. A rich nerve supply throughout the dermis includes a complex network of sensory nerves and efferent sympathetic innervation to sweat glands, vascular smooth muscles, and arrector pili muscles. Branching nerve fascicles containing myelinated and unmyelinated nerve fibers make up extensive subpapillary dermal plexuses. Myelinated nerve fibers supply nerve endings to the epidermis and encapsulated sensory receptors in the dermis including Meissner and Pacinian corpuscles. Nerve fibers entering epidermis lose myelin sheaths and end between epidermal cells either as free nerve endings or are closely associated to Merkel cells, where they serve as tactile receptors. Located in dermal papillae, Meissner corpuscles are mechanoreceptors that mediate touch. Abundant in palms and soles, they have a characteristic elongated shape, like that of a pinecone, an average diameter of 30-80 µm, and a capsule of modified, flattened Schwann cells that are arranged perpendicularly to the long axis of the receptor. Each Meissner corpuscle receives a myelinated nerve fiber that loses its myelin sheath as it ends within it. Pacinian corpuscles are larger encapsulated receptors in deeper regions of dermis and subcutaneous tissue. Deep pressure receptors, they are up to 1 mm long; they are ovoid and often flattened spheres. They consist of multiple layers of loosely arranged concentric lamellae that, on cross section, resemble layers of an onion. A single myelinated nerve fiber supplies each corpuscle and loses its myelin sheath as it enters the receptor. It is characterized by numbness, pain, tingling, burning sensation, and loss of reflexes, especially in the hands and feet. It may be mild, severe, or disabling, and there are many causes, including traumatic injury, infection, exposure to toxins. Diabetic peripheral neuropathy-a long-term complication of diabetes mellitus-is caused by exposure to elevated circulating glucose levels over extended periods of time, leading to peripheral nerve damage. In the transverse and oblique sections of the coiled secretory portion (Se) of the gland, secretory cells have a relatively pale cytoplasm and border a prominent central lumen. Several smaller, more darkly stained profiles of the duct (Du) are seen with their characteristic double cuboidal epithelium. Light-staining, pyramidal secretory cells (Se) line the lumen of a secretory acinus. Surrounding myoepithelial cells (My) at the base of the acinus share a basement membrane with secretory cells. With cholinergic innervation, they mainly serve a thermoregulatory role and maintain body temperature by evaporative heat loss. They also aid ion excretion and may, under normal conditions, produce 500-750 mL or more of sweat daily in response to thermal and emotional stimuli. They occur throughout the body but are absent on the glans penis, clitoris, and labia minora. They develop in the embryo as invaginations of epidermis, independent from pilosebaceous units, into underlying dermis. The tightly convoluted secretory part of a gland deep in the dermis consists of two types of cuboidal to pyramidal secretory cells-clear cells and dark cells. Clear cells primarily secrete water and electrolytes; dark cells elaborate macromolecular substances in sweat. Smaller, intensely eosinophilic myoepithelial cells, which share the same basement membrane but do not reach the lumen of the secretory acinus, border them. Myoepithelial cells are mainly contractile and help expel sweat into the lumen of an acinus. The spiraling duct is made of two layers of dark-staining cuboidal epithelial cells. The duct has a smaller diameter than does the secretory acinus and lacks myoepithelial cells. As it nears the surface, the duct becomes continuous with a corkscrew-shaped cleft between epidermal cells (acrosyringium), which opens at the surface via a round aperture. Innervation of eccrine sweat glands is primarily by cholinergic sympathetic nerve fibers. These glands are deep in the dermis, and appear as coiled, sac-like, tubuloalveolar tubules that store secretory product (*). Some secretory cells appear flattened, but others have a more cuboidal shape (arrows) and apical caps that project into the lumen. Myoepithelial cells (arrowheads) are around the periphery of the tubules, and share a basement membrane with secretory cells. A wide lumen (*) is lined by cuboidal-tocolumnar epithelial cells, some of which show apical blebbing (arrows). They are less coiled than eccrine sweat glands, and many coils anastomose to form an intertwining tubular network. The sac-like lumen of the secretory tubules is lined by simple cuboidal epithelium and, compared with the eccrine glands, has a wider diameter and larger, more numerous myoepithelial cells that share a basement membrane with secretory epithelium. Their yellow, viscous, oily secretion has an acrid or musky odor in response to bacterial decomposition. Secretion formation that was originally thought to be the result of a pinching off of the apical region of a cell is actually an artifact, the mode of secretion most likely being similar to that of eccrine sweat glands, and of the merocrine type. Simple cuboidal epithelium lines gland ducts, which usually open into hair follicles, just above openings of sebaceous glands. Apocrine sweat glands, innervated by adrenergic sympathetic nerve fibers, start to function at puberty and are controlled by sex hormones. Modified apocrine glands include ceruminous glands in the skin of the external auditory meatus (secrete earwax) and Moll glands associated with free margins of eyelids. The hair shaft emerges from an invagination of the epidermis (Ep); its root extends into underlying dermis. The intensely eosinophilic cuticle (Cu) is made of overlapping keratinized scales of the cuticle that interlock with cells of the inner root sheath. Except for lips, palms, soles, and a few other sites, hairs cover most of the body surface. They develop from epidermis, cross the dermis, and often extend into subcutaneous connective tissue. Each hair comprises a free shaft and a root, which is enclosed at its lower end by a tubular hair follicle, composed of epidermal (epithelial) and dermal (connective tissue) parts. The long axis of each follicle usually lies oblique to the plane of the epidermal surface. Hairs are keratinized threads that vary in thickness and length depending on body region. The central axis of the hair is the medulla-two or three layers of shrunken, keratinized cuboidal cells-which rarely extends the entire length of the hair.

Various neurotransmitters exist and include amino acids such as glutamate androgen insensitivity syndrome hormones buy flomax in united states online, catecholamines such as epinephrine and norepinephrine prostate joe theismann flomax 0.2 mg buy line, serotonin androgen hormone used in pregnancy purchase generic flomax pills, neuropeptides man health and fitness buy flomax 0.4 mg lowest price, and acetylcholine prostate 3t mri flomax 0.2 mg purchase without a prescription. In excitatory synapses, neurotransmitter release from the presynaptic neuron depolarizes the postsynaptic membrane; in inhibitory synapses, the postsynaptic membrane is hyperpolarized. In some sites, such as hypothalamus and posterior pituitary, large vesicles in presynaptic terminals may contain polypeptide hormones, for example, oxytocin or vasopressin, that are neurosecretory products, not neurotransmitters. Clear, round synaptic vesicles are abundant in the presynaptic terminal; some are clustered near the presynaptic membrane in areas called active zones. The presynaptic terminal aligns closely with the postsynaptic membrane of the target cell. In the area of membrane apposition, presynaptic and postsynaptic membranes are separated by a narrow synaptic cleft 12-30 nm wide. Clusters of large numbers of synaptic vesicles in the presynaptic terminal contain neurotransmitter that is released by exocytosis to mediate synaptic transmission. By electron microscopy, synaptic vesicles are 40-60 nm in diameter and are membrane-bound. Whether they have a clear center or an electrondense core depends on the chemical nature of the neurotransmitter. Pre- and postsynaptic membrane specializations contain electrondense material that extends into underlying cytoplasm and is usually thicker in the postsynaptic area. An action potential causes presynaptic vesicles to fuse with the presynaptic membrane and discharge neurotransmitter into the synaptic cleft. Neurotransmitter then diffuses across the cleft to interact with receptor molecules on the postsynaptic membrane, which changes postsynaptic membrane conductance. Mitochondria, sacs of smooth endoplasmic reticulum, microtubules, and neurofilaments are also seen in axon terminals. They may mimic a neurotransmitter, block a pre- or postsynaptic membrane receptor/ion channel, or affect neurotransmitter breakdown or reuptake. The opiate analgesic morphine acts on synapses by mimicking the endogenous neurotransmitter endorphin, which binds to its µ1 opioid receptor. Tanycyte Microglial cell Ventricle Ependyma Microglial cells Neuron Oligodendrocyte Astrocyte Axon Astrocyte foot process Perivascular pericyte Capillary Pia mater Confocal fluorescence image of microglia in the murine cerebral cortex. Lysosomes of various sizes and large inclusions with lipofuscin (arrows) dominate the cytoplasm. The microglial cell and many pale, delicate astrocyte processes closely abut the wall of a capillary. They are ubiquitous but are not easily detected by conventional stains; special, improved techniques are required to reveal them. The four types of cells bear descriptive names: astrocytes, oligodendrocytes, ependymal cells, and microglial cells. Except for microglia, which originate from blood monocytes, glial cells are derived from neural ectoderm. Their delicate processes terminate either on surfaces of the brain and spinal cord or on walls of blood vessels. Main functions of oligodendrocytes are to provide support to nerve fibers and produce myelin sheaths that insulate them. Ependymal cells are remnants of embryonic neuroepithelium and form a closely packed cuboidal or columnar epithelium lining the ventricles of the brain and central canal of the spinal cord. Unlike neurons, glia retain a postnatal ability to divide and are the source of most intracranial tumors, known as gliomas. The Italian Camillo Golgi (1843-1926) made his greatest contribution with his famous reazione nera, or black reaction, which permitted neurons and glial cells to be stained with osmium and silver. He discovered oligodendrocytes and microglia and viewed the latter as distinct from other neuroglia. For their pioneering work on the nervous system, Cajal and Golgi shared the Nobel Prize in Physiology or Medicine in 1906. Because this intermediate filament protein fills the cell bodies and extends into the thin cytoplasmic processes, the stellate cell shapes are clearly visualized with a Texas red secondary antibody. The cells in vitro are known to be linked by gap junctions, which is similar to the in vivo condition. Most are glial filaments, although actin filaments, as well as microtubules, may also occupy the cell interior. Although not well resolved at this magnification, gap junctions are an important junction type that electrically links the cells. This heterogeneous population includes fibrous and protoplasmic astrocytes in the brain and spinal cord, Müller cells in the retina, and pituicytes in the posterior pituitary. Many elaborate, branched cell processes extend from the stellate cell bodies into the surrounding parenchyma of the brain and spinal cord. Terminal expansions of the processes, known as perivascular end-feet, form an intimate relationship with surfaces of small blood vessels, with a complete covering forming around capillaries. They are also found around initial segments of neurons and bare axonal segments, the nodes of Ranvier. It is the most common type of glioma (tumor of glial cells) and can occur in most parts of the brain or spinal cord. It usually develops in the frontal and parietal lobes of the cerebrum and is most common in adults, especially middle-aged men. At least three different types exist, the most malignant of which is glioblastoma multiforme. This type usually grows quickly and spreads to other parts of the brain, so it is difficult to treat. As for most brain tumors, the etiology is unknown, and research attempting to discover possible causes is under way. Tight junction Capillary endothelial cell Astrocyte Histpathology: perivascular infiltration with mononuclear cells in disrupted brain tissue. These endothelial cells have sparse pinocytotic vesicles, which participate in active, unidirectional transport of protein and fluids from blood to brain. The end-feet cover more than 85% of the surface of the basement membrane; between the end-feet are gap junctions, which allow transport of potassium and other ions between the blood and the neuronal microenvironment. Acute encephalitis is most commonly a viral infection, whereas a form that leads to abscess formation usually implies a highly destructive bacterial infection. A diffuse inflammatory response commonly affects gray matter disproportionately compared with white matter. Overlying basement membrane is barely visible at this magnification, and the perivascular space is very narrow. Scattered organelles, including several mitochondria of various sizes, occupy cytoplasm of the astrocyte. Surrounding nervous tissue, known as the neuropil, consists of many tightly packed processes of neurons and glia. Most antibiotics such as penicillin do not cross the barrier in sufficient quantities because of their large molecular size and low degree of lipid solubility. A few brain regions-pineal gland, posterior pituitary, and parts of the hypothalamus-lack this barrier and contain capillaries that are highly permeable and fenestrated. Unmyelinated axons of peripheral neurons (sensory, somatic motor, or visceral motor) being surrounded by cytoplasm of a neurilemmal (Schwann) cell Neurilemmal (Schwann) cell Periaxonal space Axons Axon B. Myelinated axon of peripheral neuron (sensory, somatic motor, or visceral motor) being surrounded by a wrapping of cell membrane of a neurilemmal (Schwann) cell Neurilemmal cell Axons C. Concentric rings of Schwann cell membrane that form the multilayer myelin sheath surround the axon. Axoplasm (cytoplasm of the axon) of the nerve fiber and the surrounding extracellular space are seen. Myelin is an electrical insulator that increases conduction velocity of nerve fibers and is the physical basis for rapid saltatory conduction (in which impulses jump from one node of Ranvier to another). Myelination, a series of complex events, begins in the third fetal trimester and ends during early childhood. They are called myelinating and nonmyelinating Schwann cells, although differentiation into two groups is probably mediated by axons: nonmyelinating cells collectively ensheath groups of several small axons; myelinating cells are most often associated with one large axon. Unlike oligodendrocytes that wrap around numerous axons, one Schwann cell myelinates one segment of an axon. Schwann cells also aid debris removal and serve as guides for sprouts of regenerating axons after injury. Damage to myelin is common in neurologic diseases and leads to blocked axonal conduction, secondary damage to axons, and possibly permanent neurologic deficits. Campylobacter jejuni, a major cause of bacterial gastroenteritis, is the most frequent infectious agent; others are cytomegalovirus, Mycoplasma pneumoniae, and EpsteinBarr virus. Symptoms are progressive ascending weakness (flaccid paralysis) of the limbs, diminished tendon reflexes, and autonomic dysfunction. Histopathology includes lymphocytic (mostly T-cell) infiltration of endoneurium of peripheral nerves followed by macrophagemediated segmental demyelination of nerve fibers. By electron microscopy, macrophage pseudopodia are seen penetrating Schwann cell basal laminae near nodes of Ranvier. It is likely that immune responses directed to the infectious pathogen induce production of antibodies to gangliosides and glycolipids. The cytoplasm (Cy) of this myelin-producing cell contains many scattered ribosomes and profiles of rough endoplasmic reticulum. Several myelinated nerve fibers (*) are in close contact with the cell and seem to be embedded in its cytoplasmic processes. Several thin cytoplasmic processes emanate from the cell body, so, as its name implies, the oligodendrocyte resembles a tree with a few branches. Oligodendrocytes occur in interfascicular rows among myelinated axons; as satellite oligodendrocytes, they are closely associated with neuronal somas. Their cytoplasm contains abundant free ribosomes and rough endoplasmic reticulum, scattered mitochondria, and a Golgi complex; the cytoplasm is also replete with microtubules but lacks intermediate filaments and glycogen. During myelination, the plasma membrane of the oligodendrocyte becomes tightly wrapped around axons, the number of layers determining the thickness of the myelin sheath. The disease course is unpredictable, and the type and severity of symptoms can vary greatly. Although its etiology remains enigmatic, a leading theory proposes an autoimmune or viral cause. A few isolated ependymal cell nests (arrows) are also seen nearby, and their presence is normal in the adult. The central canal of the spinal cord is usually patent in the child and young adult but with advancing age often becomes obliterated. The ventricular lumen (*) has a ciliated ependymal lining composed of closely apposed cuboidal cells, some of which bear apical cilia (arrows). These cells bear apical microvilli to increase surface area, and most also have motile cilia that project into the ventricular lumen. Characteristic of the ependyma is the presence of apical intercellular junctions between lateral borders of contiguous cells; other types of junctions are adherens, tight, and gap junctions. Intracranial lesions, arising from the roof of the fourth ventricle, usually occur in children, whereas spinal cord tumors typically occur in adults. Treatment depends on neurosurgical intervention to facilitate definitive diagnosis. Postoperative adjuvant therapy includes radiation of the brain or spinal cord, chemotherapy, or radiosurgery. Ependymomas have no known environmental cause, but they are associated with a number of genetic mutations. A causal relationship between these mutations and tumor progression has not yet been proved, however. Hemisection of brain, brainstem, and spinal cord, with the level of section through the anterior diencephalon shown. A leaf-like process covered by simple cuboidal epithelium (Ep) is raised into small surface protrusions called villi (Vi). The choroid plexus consists of highly branched leaf-like folds of vascularized pia mater covered by a modified ependyma, which is a secretory and ion-transporting epithelium. This simple cuboidal or low simple columnar epithelium rests on a thin basement membrane. A core of loose connective tissue of the pia mater contains a tortuous network of large fenestrated capillaries that are highly permeable. This process involves active transport of sodium ions and passive diffusion of water. Tight junctions link lateral borders of epithelial cells, and basal membranes of the cells have many infoldings similar to those seen in other ion-transporting epithelial cells. With age, lightly eosinophilic and calcified concretions, known as corpora arenacea, may accumulate in the choroid plexus. To acquire fluid, a spinal needle is inserted into the subarachnoid space between lumbar vertebrae L3/L4 or L4/L5. Routine analysis includes microscopic examination with Gram stains; tests for glucose; lactate; protein; red blood cell count; and white blood cell count with differential; and cultures for bacteria, fungi, or viruses. Deeper, ill-defined layers contain different types of neurons that make up the remaining cortical gray matter. Small blood vessels (arrows) from the pia mater penetrate the cerebral cortex substance. The surrounding neuropil is an interwoven meshwork of neuronal and glial cell processes. In routine H&E sections, the neuropil appears as a finely textured eosinophilic background, but neurites in the neuropil are not well resolved. The outer surface is highly folded to increase the surface area, estimated at about 2000 cm2. Different types of neurons and fibers are arranged in horizontal layers, so the cortex appears laminated. Despite regional variations, the cortex typically consists of six ill-defined layers, which differ in neuronal population density.

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References

• Mittal S, Wu Z, Neelavalli J, et al. Susceptibility-weighted imaging: Technical aspects and clinical applications, part 2.
• McMurray TJ, Collier PS, Carson IW, et al. Propofol sedation after open heart surgery: a clinical and pharmacokinetic study. Anaesthesia. 1990;45:322-326.
• Gittelman M, Weiss H, Seidman L: A phase 2, randomized, double-blind, efficacy and safety study of oxybutynin vaginal ring for alleviation of overactive bladder symptoms in women, J Urol 191(4):1014n1021, 2014.
• Lewinsohn DM, Bowden RA, Mattson D, et al. Phase I study of intravenous ribavirin treatment of respiratory syncytial virus pneumonia after marrow transplantation. Antimicrob Agents Chemother. 1996;40:2555-2557.
• Davis CL, Feng S, Sung R, et al. Simultaneous liver-kidney transplantation: evaluation to decision making. Am J Transplant. 2007;7:1702-1709.
• Dahlke E, Murray CA, Kitchen J, Chan AW. Systematic review of melanoma incidence and prognosis in solid organ transplant recipients. Transplant Res. 2014;3:10.
• Adler DD, Helvie MA, Oberman HA, Ikeda DM, Bhan AO. Radial sclerosing lesion of the breast: mammographic features. Radiology. 1990;176(3):737-740.