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251 Spider telangiectasiaThe red lesion on the nose is a spider telangiectasia.Knowledge Weavers Dermatology
252 Kidney, acute infarctionKidney, acute infarctionKnowledge Weavers Pathology
253 PituitaryThis sagittal slice shows the neural stalk as it turns posteriorly to form the pars nervosa. The neural stalk is made up of axons from the supraoptic and paraventricular nuclei of the hypothalamus. One can clearly recognize the difference between the pars distalis and the neural tissue. Also, an hyp...Pituitary; pars nervosaUCLA Histology
254 Eye - Ciliary MuscleThe ciliary muscle is used during accommodation. The muscle consists of longitudinal and circular fibers. The circular fibers perform a sphincter - like motion and the longitudinal fibers pull the choroid forward. In either case, tension on the zonular fibers of the lens is reduced and the lens bulg...Ciliary MuscleUCLA Histology
255 Smooth MuscleThe wall of the digestive tract contains a thick inner layer of circular smooth muscle, a thick outer layer of longitudinal smooth muscle, and a thin layer of connective tissue which separates them. Try to find the cigar-shaped nuclei of longitudinally sectioned smooth muscle cells. UCLA Histology C...gastrointestinal tract; Intestine; Smooth MuscleUCLA Histology
256 FleasThe flea. These have been shown to live up to 40 days without a blood meal. The major disease we see in the Intermountain West that is carried by fleas is plague, and this is actually seen very rarely.Knowledge Weavers Dermatology
257 Gastrointestinal TractHigh power view of the sublingual gland showing striated ducts lined by low columnar epithelium. Note the numerous mixed alveoli composed of mucous alveoli capped by serous serous demilunes. UCLA Histology Collection.gastrointestinal tract; sublingual glandUCLA Histology
258 Skeletal MuscleIdentify extra fusal and intrafusal muscle fibers, and compare their cross-sectional shapes and sizes. Note the spindle capsule which surrounds the intra-fusal fibers. UCLA Histology Collection.muscle spindle; skeletal muscleUCLA Histology
259 ScalpelThis shows the scalpel, handle and blade. Note that the angle at the base of the blade, as well as the ankle at the attachment base of the scalpel handle should be the same.Knowledge Weavers Dermatology
260 AdrenalHigher magnification of the outer layers of the adrenal cortex including the capsule. The boundary between zona glomerulosa and zona fasciculata is quite irregular. UCLA Histology Collection.AdrenalUCLA Histology
261 Metastatic lung carcinomaMetastatic lung carcinomaKnowledge Weavers Pathology
262 Peripheral Nervous SystemThis is a sympathetic ganglion but all autonomic ganglias will have similar characteristics. The neuronal cell bodies are multipolar with a large eccentric nucleus. Satellite cell nuclei are distributed between the neurons but are often separated from the neurons by a space. This space is the locati...ganglion; Peripheral Nervous SystemUCLA Histology
263 Structures of acetoxy progestins (pregnane steroids)From C. Matthew Peterson, M.D. Progestogens, Progesterone Antagonists, Progesterone, and Androgens: Synthesis, Classification and Uses, Clinical Obstetrics and Gynecology, 1995; 38: 813-20. The structures of acetoxy progestins (pregnane steroids).Knowledge Weavers Human Reproduction
264 Respiratory SystemA macrophage rests on the alveolar wall. It is difficult to differentiate between type I pneumocytes and endothelial cells lining the alveolar capillaries. The type II pneumocytes, which produce surfactant, have large round nuclei with prominent nucleoli. UCLA Histology Collection.Lung; pneumocytes; Respiratory SystemUCLA Histology
265 EarThis image shows one section through the coiled cochlear canal. The scala vestibuli and scala tympani are filled with perilymph, and the scala media is filled with endolymph. Also visible is a section of the spiral ganglion and the large acoustic nerve. The cochlea is encased in bone. UCLA Histology...Cochlea; EarUCLA Histology
266 SuturingThe short and (non-needle bearing end) of the suture is then grasped with the needle holder, and the suture is pulled taut forming a double loop as shown here in cross-section. One cannot tighten the suture by pulling across the wound, andKnowledge Weavers Dermatology
267 Wound culturingIf the tissue around the wound is red and tender suggesting infection, then the wound should be cultured. The best mode of culture of a long-standing wound is to actually biopsy tissue at the base of the wound and culture that tissue.Knowledge Weavers Dermatology
268 PlacentaUterine Decidual Cells. This image of the postpartum uterus illustrates the marked change in the endometrial stromal cells as they become decidual cells. UCLA Histology Collection.Decidual Cells; Placenta; uterusUCLA Histology
269 OvaryThis image illustrates the relatively acellular scar of a corpus luteum, the corpus albicans embedded in the stroma. UCLA Histology Collection.corpus albicans; OvaryUCLA Histology
270 Renal cell carcinomaRenal cell carcinomaKnowledge Weavers Pathology
271 Skeletal MuscleNote the sarcomeres in this image, and relate them to previous images. Identify the peripherally located myonuclei in both cross-sectioned and longitudinally sliced fascicles. Also identify the fibroblasts of the connective tissue sheath which surrounds the muscle fiber seen here. UCLA Histology Col...skeletal muscle; TongueUCLA Histology
272 PituitaryThis sagittal slice shows the components of the pituitary stalk: the pars tuberalis and the neural stalk. The hypophyseal portal vessels of the pars tuberalis can be seen here in longitudinal section. The neural stalk is composed of axons which terminate in the pars nervosa (posterior pituitary). UC...Pituitary; pituitary stalkUCLA Histology
273 PlacentaMost of this image consists of a tertiary fetal villus. Note the fetal blood vessels and the fetal mesenchyme. The fetal villus is lined by the syncytiotrophoblast but cytotrophoblast cells are still present. The maternal blood space is obvious. UCLA Histology Collection.PlacentaUCLA Histology
274 Male Urinary SystemOne of the hallmarks of the prostatic gland is a prostatic concretion. This tubulo-alveolar gland is lined by a pseudostratified epithelium (here the basal cells are easily observed). UCLA Histology Collection.Prostate; prostatic concretion; prostatic glandUCLA Histology
275 Gastrointestinal Tract - LipThis is a low power view of the mucous (oral) aspect of the lip. Here the lip is covered by non-keratinized stratified squamous epithelium. Note that the dermis contains labial glands (predominantly mucous salivary glands). UCLA Histology Collection.UCLA Histology
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