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BIO 241 HISTOLOGY REVIEW Digestive System Dr. Tim Ballard Department of Biology and Marine Biology
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Basic histological plan of the GI tract
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Esophagus Arrow = epithelium of trachea M = mucosa SB = submucosa ME = muscularis externa A = adventitia
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Esophagus Arrow = epithelium ME = muscularis externa Arrowheads = Blood vessels in the submucosa
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Esophagus Arrow = duct of mucous secreting gland in the submucosa mucous gland stratified squamous epithelium
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Esophagus muscularis externa inner circular outer longitudinal adventitia submucosa
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Stomach
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Fundic Stomach Arrowhead = muscularis mucosae Arrow = muscularis externa
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Arrowhead = neck mucous cells Typical gastric gland parietal cells chief cells
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Arrow = muscularis mucosae ME = muscularis externa Stomach wall parietal cells chief cells submucosa
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Arrow = gastric glands Arrowheads = lymphocytes Pyloric stomach
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Curved Arrow = villus Arrow = Brunners gland Arrowhead = lymphatic tissue Duodenum muscularis externa intestinal gland
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V = villi S = submucosa PC = plica circularis M = mucularis mucosa arrowheads = intestinal glands Ileum
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Ileum Arrow = Peyers patches Arrowhead = mesentery villus
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Arrow = smooth muscle of taenia coli Colon mucosa no villi submucosa muscularis
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Colon goblet cells simple columnar cells
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Liver Arrowhead = capsule Arrows = interstitial c.t. Curved arrow = central vein lobule portal triad
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Liver – portal triad A = Hepatic artery B = Portal vein C = bile duct simple cuboidal epithelium
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Liver – hepatocytes and sinusoids A = central vein B = Portal tract Look for sinusoids as the spaces between cords of hepatocytes
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Liver – bile canaliculi Arrowhead = endothelium of central vein sinusoid Look for canaliculi between adjacent rows of hepatocytes
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Pancreas -- lobules Arrow = Islets of Langerhans Arrowhead = septa lobule
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Pancreas -- acinus interlobular duct connective tissue acini
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