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Digestion 2, Fundic - most of stomach ???? Surface epith. secrete mucus insoluble/cloudy mucus, Fundic - most of stomach ???? Mucous Neck cells in neck region secrete soluble mucous diff from surface cells, Fundic - most of stomach ???? Entero(neuro)endocrine aka Argentaffin cells all levels, esp. base of glands secrete peptides/hormones eg gastrin stim HCl secretion clear cyto, not always to lumen, Small Intestine Features -plicae circularis(valves of Kerkring) folds w/ core of submuc -absorptive cells w/ mi'villi-actin core -crypts of Lieberkuhn-b/w villi bases thru L. prop. eosinophilic Paneth cells in base-lysozyme -contain enterocytes, Goblet, ent'crine cells -4 layers as always, w/ Brunner's in submuc serosa, not adventitia, Mucosa simple col. epith secrete mucous lam. prop.-loose CT, lymphatics, branched tub. gastric glands musc. mucosa-sm. m inner circ, outer long. Submucosa w/ a/v/n ???? Gastric glands empty into foveolae fundic-long glands, short pits pyloric - short glands, long pits, Rectum sim to colon few glands, many goblet cells no teniae coli store fecal matter transverse rectal folds Anorectal junction below Pectinate line- change from simple col to strat squa Anal canal anal columns-long. folds contain br. of sup rectal a/v merge at Pec. line-anal valves anal sinuses-valleys b/w folds contains submuc venous plexus site of internal hemorrhoids, Gastric glands empty into foveolae fundic-long glands, short pits pyloric - short glands, long pits ???? Cardiac - entrance tub, tortuous, bra. mucus-secreting cells enteroendocrine too protect against reflux, Duodenum-25 cm Jejunum-2.5 m Ileum-3.5 m ???? Duodenum Brunner's glands in submuc basic, zym/muc secretion branched, tubular fewest Goblet cells more absorptive fcn leaf-shaped villi, Gastric glands empty into foveolae fundic-long glands, short pits pyloric - short glands, long pits ???? Pyloric-antrum sim cells to surface muc so viscous mucus bra, coiled, tub wide lumen some ent'crine some parietal, Large Intestine ???? Cells many goblet cells to lube stool in Crypts of Lieberkuhn absorptive cells w/ few mi'villi NO Paneth Cells some ent'crine cells