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Shoupisms on the digestive tract - 6 The muscularis externa...

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Shoupisms on the digestive tract: 1. The parotid is a pure serous gland like the exocrine part of the pancreas 2. There is no simple squamous epithelium in the mucosa of the GI tract; the oral cavity, esophagus, and anus are lined by stratified squamous; the stomach, small intestine, and large intestine are lined by simple columnar. 3. There are no goblet cells in the stomach . 4. Villi are found only in small intestine. 5. The submucosa is the CT " under" the muscularis mucosae. There are only two places in the entire GI tract that have submucosal mucus secreting exocrine glands. These two places are the esophagus and the proximal duodenum. All the gastric glands , glands of the small intestine, and the large intestine are in the mucosa. There are only two places in the GI tract where we have submucosal glands.
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Unformatted text preview: 6. The muscularis externa typically consists of an inner circular and outer longitudinal layer. In the proximal esophagus the muscularis externa is skeletal muscle (we can swallow at will) and skeletal muscle is also present in the anal sphincter. 7. The most distinctive feature of the duodenum are the submucosal glands of Brunner. The most distinctive feature of the jejunum are plicae circulares. The most distinctive feature of the ileum are Peyer's patches (part of lymphoid system). 8. The mucosa of the stomach and colon are essentially flat (no projections into lumen). Villi are only in small intestine. 9. Paneth cells are found only a base of the crypts of the small intestine. There are no Paneth cells in the stomach or colon. Why?...
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