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Biology 106

Biology 106. Digestive system. Stomach. Ileum. Stomach T.S . of the stomach of rabbit. The tube wall in General made up of 4 layers From the outer layer to the inner: Serosa : (Simple squamous epithelium) Muscularis : (L.M.L and C.M.L) Submucosa : (C.T. ,B.V., muscularis mucosa layer)

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Biology 106

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  1. Biology 106 Digestive system

  2. Stomach Ileum

  3. StomachT.S. of the stomach of rabbit • The tube wall in General made up of 4 layers From the outer layer to the inner: • Serosa : (Simple squamous epithelium) • Muscularis: (L.M.L and C.M.L) • Submucosa: (C.T. ,B.V., muscularis mucosa layer) • Mucosa: (simple tubular glands; have 3 cell types: a- Simple columnar cells, b-Peptic cells secrete digestive enzyme, c-Oxyntic cells secrete HCL.

  4. Serosa • It composed of very thin layers of loose connective tissue+(Simple squamous epithelium)

  5. Muscularis • Composed of smooth muscle fibers • Longitudinal external layer (L.M.L.) • Circular inner layer (C.M.L)

  6. Submucosa • Consists of loose connective tissue, blood and lymph vessels. • It is a very light area.

  7. The mucosa The thickest layer, consists of : • Layer of simple columnar epithelium+ Gastric gland • the muscularis mucosae consists of : • An inner circular smooth muscle fibers • An outer longitudinal smooth muscle fiber + blood vessels.

  8. Gastric glands have 4 types: Two of them are well distinguished 1- peptic cells secrete digestive enzymes 2- oxyntic cells secrete HCL

  9. Ileum is the smallest part of samll intestineT.S. of the ileum of rabbit • The tube wall in General made up of 4 layers From the outer layer to the inner: • Serosa : (Simple squamous epithelium) • Muscularis: (L.M.L and C.M.L) • Submucosa: (C.T. ,B.V., muscularis mucosa layer) • Mucosa: intestinal villi and crypts of Lieberkuhn lined with simple columnar and globlet cells (secrete mucous)

  10. Hisology: T.S. of the ileum of rabbit

  11. Mucosa • Intestinal villi increase intestinal absorptive surface , Villi also help the intestines to move food along the digestive pathways. • Crypts, Intestinal glands are located in the crypts of Lieberkuhn at the base of the villus .

  12. Liver • The liver is the body's largest compound gland. It is a major metabolic organ, and is important for degrading alcohol and drugs.

  13. T.S. of the liver of the pig • A reticular gland formed of the cells arranged in strands crossing each other forming network • The strands form hepatic lobules • Each lobules has a central vein and blood sinusoids.

  14. Among these lobules there are C.T. and many portal spaces. • Each portal space contains branch of portal vein, branch of hepatic artery and bile ductule.

  15. Thank you

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