Anatomy Chapters 2-4: Chemistry, Biology, Cytology, and Histology
BIO 241 HISTOLOGY REVIEW Digestive System Dr. Tim Ballard Department of Biology and Marine Biology.
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Transcript of BIO 241 HISTOLOGY REVIEW Digestive System Dr. Tim Ballard Department of Biology and Marine Biology.
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BIO 241 HISTOLOGY REVIEWBIO 241 HISTOLOGY REVIEWDigestive SystemDigestive System
Dr. Tim BallardDr. Tim Ballard
Department of Biology and Marine BiologyDepartment of Biology and Marine Biology
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Basic histological plan of the GI tractBasic histological plan of the GI tract
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EsophagusEsophagus
Arrow = epithelium of trachea M = mucosa SB = submucosaME = muscularis externa A = adventitia
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EsophagusEsophagus
Arrow = epithelium ME = muscularis externa Arrowheads = Blood vessels in the submucosa
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EsophagusEsophagus
Arrow = duct of mucous secreting gland in the submucosa
mucous gland
stratified squamous epithelium
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EsophagusEsophagus
stratified squamous epithelium
muscularis externa
inner circularouter
longitudinal
adventitia
submucosa
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StomachStomach
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Fundic StomachFundic Stomach
Arrowhead = muscularis mucosae Arrow = muscularis externa
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Arrowhead = neck mucous cells
Typical gastric glandTypical gastric gland
parietal cellschief cells
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Arrow = muscularis mucosae ME = muscularis externa
Stomach wallStomach wall
parietal cells
chief cells
submucosa
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Arrow = gastric glands Arrowheads = lymphocytes
Pyloric stomachPyloric stomach
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Curved Arrow = villus Arrow = Brunners gland Arrowhead = lymphatic tissue
Duodenum Duodenum
mus
cular
is
exte
rna
intestinal gland
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V = villi S = submucosa PC = plica circularis M = mucularis mucosa arrowheads = intestinal glands
Ileum Ileum
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Ileum Ileum
Arrow = Peyers patches Arrowhead = mesentery
villus
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Arrow = smooth muscle of taenia coli
Colon Colon
mucosa
no villi
submucosa
muscularis
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Colon Colon
goblet cells
simple columnar cells
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LiverLiver
Arrowhead = capsule Arrows = interstitial c.t. Curved arrow = central vein
lobule
portal triad
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Liver – portal triadLiver – portal triad
A = Hepatic artery B = Portal vein C = bile duct
simple cuboidal epithelium
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Liver – hepatocytes and sinusoidsLiver – 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 canaliculiLiver – bile canaliculi
Arrowhead = endothelium of central vein
sinusoidLook for canaliculi between
adjacent rows of hepatocytes
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Pancreas -- lobulesPancreas -- lobules
Arrow = Islets of Langerhans Arrowhead = septa
lobule
lobule
lobule
lobule
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Pancreas -- acinusPancreas -- acinus
interlobular duct
connective tissue
acini