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226 Gastrointestinal TractThis is a higher magnification of the esophageal-cardiac junction showing the passage from non-keratinized stratified squamous epithelium of the esophagus to simple columnar epithelium of the cardia (the entry region of the stomach). In the stomach are also shown gastric pits, gastric glands, and th...cardiac sphincter; Esophagus; gastrointestinal tract; StomachUCLA Histology
227 Circulatory SystemIn this aorta stained with Trichrome, identify pink elastin, blue collagen, and reddish muscle cells. Here the boundary between the tunica intima and tunica media is less distinct. However, the lumen is quite obvious. UCLA Histology Collection.Aorta; Circulatory System; elastic artery; trichrome; tunica intima; tunica mediaUCLA Histology
228 Epithelium - StomachAt an even higher power, the simple columnar epithelium of the stomach can be seen to consist of one layer of very long cells; the nucleus is at the base and the mucus is at the apex of these cells. Stratified squamous epithelium of esophagus. UCLA Histology Collection.simple columnar epithelium; stratified squamous epitheliumUCLA Histology
229 Smooth MuscleNote the varying sizes of smooth muscle nuclei and cells. In what plane of section were these cut? Identify the smooth muscle cells, and their nuclei. Note that many of these cells appear to lack nuclei, because they are out of this plane of section. UCLA Histology Collection.Smooth MuscleUCLA Histology
230 PemphigusThis patient has pemphigus. In this disease, there are antibodies produced against components of the materials that hold the epidermal cells together, and the epidermis breaks apart within the mid-epidermal level.Knowledge Weavers Dermatology
231 Respiratory SystemObserve the narrowing of this small bronchus (with cartilage plates) into a bronchiole, terminal bronchiole, then respiratory bronchiole (with intermittent alveoli). A branch of the pulmonary artery is also visible. UCLA Histology Collection.Lung; Respiratory SystemUCLA Histology
232 Seborrheic keratosesOne month after freezing seborrheic keratoses showing slight residual inflammation and postinflammatory hyperpigmentation. This generally resolves within several months after the procedure.Knowledge Weavers Dermatology
233 Micrograph of the base of hair follicleAn electron micrograph of the base of hair follicle. The epidermal papilla, shown at the bottom center, controls the growth rate of the hair follicle.Knowledge Weavers Dermatology
234 MelanomaMelanoma in the scalp of a patient approximately 65-years-old.Knowledge Weavers Dermatology
235 PituitaryThis is a coronal slice reconstructed by computer technology to demonstrate the median eminence of the hypothalamus which lies inferior to the third ventricle. Certain neurons of the median eminence terminate adjacent to capillary loops which drain into portal vessels. These portal vessels of the pa...PituitaryUCLA Histology
236 Circulatory SystemThe aortic tunica intima is largely composed of pink-stained collagen fibers. Elastin appears here as black, squiggly lines. The tunica media contains large amounts of elastin, collagen, and smooth muscle. The components of the tunica media are organized in sheet-like laminae, with holes or fenestra...Aorta; Circulatory System; elastic artery; tunica intima; tunica mediaUCLA Histology
237 Gastrointestinal TractThis is a higher magnification of a region of the fundic gland showing the large acidophilic parietal cells (red staining) and the dark basophilic chief cells (blue/purple staining). Note the presence of small granules within the parietal cells. UCLA Histology Collection.gastrointestinal tract; StomachUCLA Histology
238 Bone - Haversian SystemThis is an example of compact bone. A Haversian system consists of concentric layers (lamellae) of bone surrounding a central Haversian canal in which blood vessels and nerves are located. The osteocytes are found within small lacunae. Marrow cavity. UCLA Histology Collection.compact boneUCLA Histology
239 Gastrointestinal Tract - CementumThis is a low power image from a longitudinally sectioned, decalcified monkey tooth. This view shows the dentin, cellular cementum, and the light pink periodontal ligament which anchors the tooth to the alveolar bone. Cementocytes, which resemble osteocytes, may be found in this region of cementum. ...UCLA Histology
240 Ingrown nailThis demonstrates local infiltration of the skin around the nail. It is crucial to inject slowly and to advance the needle slowly. I found local infiltration to be superior to a digital block.Knowledge Weavers Dermatology
241 HirsutismThis woman has polycystic ovarian syndrome and hyperandrogenemia resulting in hirsutism.Knowledge Weavers Human Reproduction
242 Urinary systemThe urethra has a stratified columnar epithelium except near the urinary bladder where it becomes a transitional epithelium. UCLA Histology Collection.urethra; Urinary systemUCLA Histology
243 Endothelium - SpleenThis high magnification image of red pulp reveals sinusoids and the endothelial cells that line their walls. UCLA Histology Collection.red pulpUCLA Histology
244 Male reproductive system - Efferent Ducts and Ductus EpididymisCompare and contrast the efferent ducts and the ductus epididymis. The efferent ducts are lined with simple columnar epithelium composed of tall and short cells which give the lumen a star shaped appearance. The efferent ducts conduct maturing sperm into a single highly coiled tube, the ductus epidi...Male reproductive systemUCLA Histology
245 Lymph NodesThis section demonstrates medullary cords that contain packed strips of lymphocytes. Between the cords are spaces known as medullary sinuses through which lymph percolates. The cortex of this lymph node contains secondary follicles or nodules, which show pale central regions, the germinal centers. N...germinal center; Lymph Node; medullary cords; medullary sinusesUCLA Histology
246 Gastrointestinal TractHigh power view of the crypts of Lieberkuhn showing epithelial cells with dark granules. These are hormone secreting endocrine cells (called argentaffin cells) that can be distinguished from the other epithelial cells by the cytoplasmic accumulation of silver granules. UCLA Histology Collection.crypts of Lieberkuhn; gastrointestinal tract; small intestineUCLA Histology
247 Connective TissueIn the dermis of the skin, adipocytes (fat cells) are also present. These cells appear empty because the organic solvents used in tissue preparation dissolve away fat. Sweat glands are also found deep within the dermis. UCLA Histology Collection.connective tissue; Skin; Sweat glandsUCLA Histology
248 Connective TissueAdipose (fat) cells. Note that the nuclei are pushed to the periphery of the cell by the large central accumulation of lipid. UCLA Histology Collection.Connective TissueUCLA Histology
249 ThyroidWith this special stain it is possible to demonstrate the clusters of black-stained parafollicular cells which secrete calcitonin. UCLA Histology Collection.ThyroidUCLA Histology
250 Capillary hemangiomasThe red papules are benign vascular growths called capillary hemangiomas.Knowledge Weavers Dermatology
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