Biology 106 Digestive system.

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Presentation transcript:

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) Mucosa: (simple tubular glands; have 3 cell types: a- Simple columnar cells, b-Peptic cells secrete digestive enzyme, c-Oxyntic cells secrete HCL.

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

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

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

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.

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

Ileum is the smallest part of samll intestine T. S Ileum is the smallest part of samll intestine T.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)

Hisology: T.S. of the ileum of rabbit

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 .

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

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.

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.

Thank you