BIO 241 HISTOLOGY REVIEW Digestive System Dr. Tim Ballard Department of Biology and Marine Biology.

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Presentation transcript:

BIO 241 HISTOLOGY REVIEW Digestive System Dr. Tim Ballard Department of Biology and Marine Biology

Basic histological plan of the GI tract

Esophagus Arrow = epithelium of trachea M = mucosa SB = submucosa ME = muscularis externa A = adventitia

Esophagus Arrow = epithelium ME = muscularis externa Arrowheads = Blood vessels in the submucosa

Esophagus Arrow = duct of mucous secreting gland in the submucosa mucous gland stratified squamous epithelium

Esophagus muscularis externa inner circular outer longitudinal adventitia submucosa

Stomach

Fundic Stomach Arrowhead = muscularis mucosae Arrow = muscularis externa

Arrowhead = neck mucous cells Typical gastric gland parietal cells chief cells

Arrow = muscularis mucosae ME = muscularis externa Stomach wall parietal cells chief cells submucosa

Arrow = gastric glands Arrowheads = lymphocytes Pyloric stomach

Curved Arrow = villus Arrow = Brunners gland Arrowhead = lymphatic tissue Duodenum muscularis externa intestinal gland

V = villi S = submucosa PC = plica circularis M = mucularis mucosa arrowheads = intestinal glands Ileum

Ileum Arrow = Peyers patches Arrowhead = mesentery villus

Arrow = smooth muscle of taenia coli Colon mucosa no villi submucosa muscularis

Colon goblet cells simple columnar cells

Liver Arrowhead = capsule Arrows = interstitial c.t. Curved arrow = central vein lobule portal triad

Liver – portal triad A = Hepatic artery B = Portal vein C = bile duct simple cuboidal epithelium

Liver – hepatocytes and sinusoids A = central vein B = Portal tract Look for sinusoids as the spaces between cords of hepatocytes

Liver – bile canaliculi Arrowhead = endothelium of central vein sinusoid Look for canaliculi between adjacent rows of hepatocytes

Pancreas -- lobules Arrow = Islets of Langerhans Arrowhead = septa lobule

Pancreas -- acinus interlobular duct connective tissue acini