BIO 241 HISTOLOGY REVIEW Digestive System

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