histology of the digestive system

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الشريحة 1 histology of the digestive system structure of the gastrointestinal tract (git) is the same from oesophagus to the anus. mucosa shows variations in different regions of the tract according to the function of the particular part. gastrointestinal tract shows four layers: 1) mucous membrane or mucosa is made up of three components: epithelium: is stratified squamous epithelium (may be either keratinized or nonkeratinized depending on the diet). lamina propria: is a layer of loose areolar tissue. muscularis mucosa produces local movement of mucosa. 2) submucosa: is loose collagenous connective tissue showing blood vessel, lymphatics and nerves, shows submucosal plexus. it also shows oesophageal glands. 3) muscularis propria or muscularis externa is a smooth muscle arranged usually in two layers – inner circular and outer longitudinal. the action of these two layers at right angles to one another brings about peristaltic contraction. between the two layers of muscularis externa …

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e eosinophilic cytoplasm and central nucleus. they secrete hcl and intrinsic factor necessary for absorption of vit. b12. d) chief cells, peptic or zymogenic cells: they are found near the base of the gland. they show basophilic cytoplasm and basally located nuclei. these are secreting pepsin. e) neuroendocrine cells: they are also seen near the base of the gland. they secrete serotonin. f) stem cells: they are seen near the neck of the gland. fundic gland region chief cells muscularis propria shows three layers inner most oblique, middle circular and outer longitudinal. glands of the pylorus secrete mucous. muscularis propria small intestine: is the principal site for digestion and absorption of the product of digestive tract. four factors provide an enormous surface area to achieve this function. great length of small intestine. mucosa and submucosa form fold called plica circularis. mucosa shows finger like processes called villi between the bases …

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large intestines lack villi and contain only intestinal crypts. principal function is the recovery of water and salt. epithelium with large number of goblet cells tunica muscularis: generally, the tunica muscularis consists of an inner circular and outer longitudinal layer of smooth muscle. there are modifications, which are highly variable depending on the species. the most common variable is that the outer layer is modified as a distinct band., teniae coli. tunica muscularis

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الشريحة 1 histology of the digestive system structure of the gastrointestinal tract (git) is the same from oesophagus to the anus. mucosa shows variations in different regions of the tract according to the function of the particular part. gastrointestinal tract shows four layers: 1) mucous membrane or mucosa is made up of three components: epithelium: is stratified squamous epithelium (may be either keratinized or nonkeratinized depending on the diet). lamina propria: is a layer of loose areolar tissue. muscularis mucosa produces local movement of mucosa. 2) submucosa: is loose collagenous connective tissue showing blood vessel, lymphatics and nerves, shows submucosal plexus. it also shows oesophageal glands. 3) muscularis propria or muscularis externa is a smooth muscle arranged usually i...

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