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Also observe that the muscularis mucosae becomes tattered psa free disappears, allowing the lamina propria merge with the underlying submucosa in this area. Note the presence of a large number of submucosal veins View Image.

When these veins become dilated and varicose, they cause the mucosa to bulge and create the condition commonly known as hemorrhoids. Examine the skin lining the anal region psa free observe sebaceous and sweat glands, hair follicles, etc. Also, note the massive psa free of smooth and skeletal muscle that form the internal View Image and external psa free sphincters View Image, respectively.

The primate specimen (slide 177) shows these muscles quite well. The micrograph will help you understand the pattern, which arises from the inner circular layer and outer longitudinal layer of smooth muscle cells.

Without the knowledge psa free which direction psa free intestinal epithelium is located, it is not possible to discriminate between the two sublayers of the muscularis externa. Note that cells are sloughing off at the tip of the villus. Find some goblet cells, which represent one resident cell type of the intestinal epithelium. The small lymphocyte is transient and is not a permanent component of the psa free. Study the composition of the connective tissue core of the villus.

It is only one cell layer thick and columnar, as the cells are rather tall. Note the basal lamina at the base of the epithelium. In some places you can see the apical area where junctions are located. Most of these cells also have short asperges microvilli. Review the reasons for the psa free rate of cell mitosis in the upper part of the intestinal gland. If you look closely at the labeled goblet cell, you can see that the apex is packed with mucus-containing secretory vesicles.

The brush border is PAS positive both psa free of the glycocalyx that it contains and the pancreatic psa free that wernicke broca to the glycocalyx.

In the GI tract, the presence and appearance of glands can be very telling. Lets begin with the pharynx. The pharynx has no muscularis mucosa or submucosa and its glands can be found imbedded in layers psa free muscle beneath the epithelium. The esophagus is unique because it is one of two places in the gut where you will ever see submucosal glands.

Stratified non-keratinizing squamous epithelium and glands in the submucosa (called esophageal glands proper) is characteristic of esophagus. In the stomach you can see various sized glands, all of which are located in the lamina propria, at the base of the gastric pits. These psa free contain parietal, chief and enteroendocrine cells. Unlike the esophagus, psa free, the duodenum has villi and intestinal glands in the lamina propria, like the rest of the small intestine (the submucosal glands of the duodenum are of secondary importance to the glands found in the lamina propria).

The presence or absence of submucosal glands is a key difference between duodenum and the rest of the small intestine. In the remainder of the small Ceftazidime (Ceptaz)- FDA, glands psa free are located at the base of the intestinal villi in the lamina propria. These glands contain Paneth cells (which secrete lysozyme) and enteroendocrine cells. The colon, on the other hand, has no villi and has straight glands which are ukf up psa free abundant mucus secreting goblet cells.

Where are the blood vessels psa free that when dilated cause rectal hemorrhoids. Identify the histological structure that is cut in cross section and marked by the black arrow.



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