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6 histologyofthedigestivesystem

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Unformatted text preview: testines with digestive juices. 4. Chemical Digestion ­ Carbohydrates, Fat, and Proteins are broken down by enzymes. 3.. 3 Absorption ­ transfer of the digested portion of food into the blood from the digestive canal. 5.. 5 Defecation ­ removal/elimination of the waste products from the body. 6. Histology of the Digestive System Histology of the Digestive System 1. 2. 3. 4. All alimentary canal organs have the same 4 layers. Mucosa (innermost layer) Submucosa (CT containing neurovascular bundles) Muscularis Externa (2 layers of smooth muscle) Serosa (outermost layer, visceral peritoneum) Diagram of GI wall to show various kinds of glands -- some within the wall and some without (like the liver). These glands have ducts that empty into the lumen of the gut. In all cases, the epithelium lining the ducts and glands is continuous with the epithelium lining the lumen (cavity) of the gut. The image above shows a section of colon from a dog. Note the crypts extendingfrom the lumen, and the n...
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