stomach - philipdarrenjones.com
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Stomach• Simple columnar epithelium, no villi or gobletcells• Mucosa is thrown into irregular folds = rugae• Three layers of smooth muscle (additionaloblique layer)• Gastric pits and gastric glands in mucosa
Ruga Mucosa
Submucosa
Muscularisexterna
Serosa
Organization(more review)
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StomachCell types:• Mucous epithelial cells (1)• Mucous neck cells• Parietal cells (2)• Zymogenic cells (3)
Gastric pit
Gastric gland
1
3
2
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Small intestine – general features• Simple columnar epithelium with goblet cells that increase in number distally• Plicae circulares – large folds of mucosa and submucosa• Villi – finger like projections of the mucosa (epithelium and lamina propria) into thelumen• Crypts of Lieberkuhn – projections of lumen into mucosa
Plica circularis Several villi Two villi
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Duodenum• Brunner’s glands in submucosa • Simple columnar• Villi are relatively long, but wide• very few goblet cells
Brunner’s glandsLacteal
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Jejunum• No glands or lymphatic tissue in submucosa• villi are very long and skinny• number of goblet cells greater than duodenum
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Ileum• Numerous discrete patches of lymphatictissue in the submucosa (Peyer’s patches)• villi are short and squat• many goblet cells
Peyer’s patch
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Colon (Large intestine)• Simple columnar with many goblet cells, no villi, but intestinal crypts• No fecal concretions• Sometimes concentrated lymphatic nodules
Lymphaticnodule
Tenia coli