BIO 240 HISTOLOGY REVIEW The Skin Dr. Tim Ballard Department of Biology and Marine Biology.
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.
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
Basic histological plan of the GI tractBasic histological plan of the GI tract
EsophagusEsophagus
Arrow = epithelium of trachea M = mucosa SB = submucosaME = muscularis externa A = adventitia
EsophagusEsophagus
Arrow = epithelium ME = muscularis externa Arrowheads = Blood vessels in the submucosa
EsophagusEsophagus
Arrow = duct of mucous secreting gland in the submucosa
mucous gland
stratified squamous epithelium
EsophagusEsophagus
stratified squamous epithelium
muscularis externa
inner circularouter
longitudinal
adventitia
submucosa
StomachStomach
Fundic StomachFundic Stomach
Arrowhead = muscularis mucosae Arrow = muscularis externa
Arrowhead = neck mucous cells
Typical gastric glandTypical gastric gland
parietal cellschief cells
Arrow = muscularis mucosae ME = muscularis externa
Stomach wallStomach wall
parietal cells
chief cells
submucosa
Arrow = gastric glands Arrowheads = lymphocytes
Pyloric stomachPyloric stomach
Curved Arrow = villus Arrow = Brunners gland Arrowhead = lymphatic tissue
Duodenum Duodenum
mus
cular
is
exte
rna
intestinal gland
V = villi S = submucosa PC = plica circularis M = mucularis mucosa arrowheads = intestinal glands
Ileum Ileum
Ileum Ileum
Arrow = Peyers patches Arrowhead = mesentery
villus
Arrow = smooth muscle of taenia coli
Colon Colon
mucosa
no villi
submucosa
muscularis
Colon Colon
goblet cells
simple columnar cells
LiverLiver
Arrowhead = capsule Arrows = interstitial c.t. Curved arrow = central vein
lobule
portal triad
Liver – portal triadLiver – portal triad
A = Hepatic artery B = Portal vein C = bile duct
simple cuboidal epithelium
Liver – hepatocytes and sinusoidsLiver – hepatocytes and sinusoids
A = central vein B = Portal tract
Look for sinusoids as the spaces between cords of hepatocytes
Liver – bile canaliculiLiver – bile canaliculi
Arrowhead = endothelium of central vein
sinusoidLook for canaliculi between
adjacent rows of hepatocytes
Pancreas -- lobulesPancreas -- lobules
Arrow = Islets of Langerhans Arrowhead = septa
lobule
lobule
lobule
lobule
Pancreas -- acinusPancreas -- acinus
interlobular duct
connective tissue
acini