GIT Flashcards
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mucosa
stratified squamous or simple columnar
hard palate
ketatinized mucous epithelium
soft palate
non keratinized mucous epithelium
toungue
striated muscle covered by non keratinized stratified squamous epithelium and lamina propria.
taste buds have 3 cell types
gustatory(taste cells),sustentacular(support)cells and basal cells(stem cells)
papillae
stratified squamous epithelium
esophagus
lined by stratified squamous epithelium non keratinized
specialization of esophagus tissues
esophageal glands proper-tubuloacinar mucus secreting glands esophageal cardiac glands-small branched mucussecreting glands
gastroesophageal junction
transition from stratified squamous to glandular secretory mucosa.
simple columnar epithelium of stomach facing the lumen is modified so that
all cells secret mucus ,forming a sheet gland that protects the stomach from its acidic environment.
gastric glands have
isthmus,neck and base
stomach cells
mucous cells-secrete mucous to protect epithelial cells from enzymes&acid. parietal cells-secrete HCL for protein digestion and intrinsic factor for B12 absorption. chief cells-secrete pepsinogen. G-cells-secret gastrin
muscularis externa
made of 3 muscular layers;internal oblique layer,middle circular layer and outer longitudinal layer that is separated from circular layer by Auerbach’s plexus
mucosal epithelium of S.I composed of
1.absorptive cells-form simple columnar epithelium . 2.goblet cells intestinal glands have;paneth cells-contents digest bacterial cell walls and enteroendocrine cells
variations specific to intestinal subdivisions
1.brunner’s glands-present in duodenum.;secret an alkaline mucus to neutralize acidity of stomach contents. 2.peyer’s patches-clusters of lymphoid nodules located in the ileum.