GI Introduction Krum
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18 terms
Terms | Definitions |
|---|---|
 What are the 3 gross divisions of the small intesting? | duodenum, jejunum, ileum |
| What are the permanent folds of the mucosa and submucosa that extend 2/3 of the way to the lumen and increase the surface area by 3x? | plicae circulares |
| What are the invaginations between the bases of the villi which form the intestinal glands? | Crypts of Lieberkuhn |
| What covers the apical portion of the intestinal absorptive cells and amplify the surface area exposed to the lumen 30x? | microvilli |
| What is resistant to proteolysis and consists of highly branched chains of integral membrane glycoproteins covering the microvilli? | glycocalyx |
| What type of epithelium are the villi composed of? | simple columnar epithelium |
| What forms the loose connective tissue core of each villus? | lamina propria |
| What lymphatic capillary of the villi is important for fat absorption? | lacteal |
| Where are mitotically active stem cells of the intestinal glands located? | just above Paneth cells in base of the Crypts of Lieberkuhn |
| What is between the crypts of lieberkuhn? | Lamina Propria |
| How deep do the crypts of lieberkuhn extend into the villi? | to the muscularis mucosae but do not penetrate |
| Which layer of the intestine is rich in elastic fiber and moderately dense irregular CT? | submucosa |
| Which neural ganglie is contained in the submucosa? | Meissner's Plexus |
| What layer of the intestine is responsible for the segmentation and peristalsis? | Muscularis Externae |
| Where is the myenteric Auerbach's plexus located? | between the inner circular and outer longitudinal layer of the muscularis externae |
| What consists of aggregations of neurons which innervate the muscularis externae? | myenteric Auerbach's plexus |
| What covers the intestines and allows for frictionaless sliding during peristalsis? | Serosa |
| What epithelium is serosa composed of? | mesothelium (simple squamous) |
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