Histology: The Digestive System By Andrew W Histology: The Digestive System By Andrew W. Parsons Copyright 2000, All Rights Reserved. Material is in logical order: see texts, lab. outline for characteristics To advance to next slide: -click mouse or “page down” To return to the previous slide: - press “page up”
Histology: four layers: -Mucosa -epithelium: stratified squamous or simple columnar -lamina propria: areolar c.t. -muscularis mucosa: smooth muscle -Submucosa: dense irregular c.t. -Muscularis externa: skeletal muscle (upper esophagus), smooth muscle elsewhere (-oblique layer: stomach only) -circular layer -longitudinal layer -Serosa or adventitia: simple squamous epith., areolar c.t.
The Esophagus -Stratified squamous epithelium -Skeletal muscle in m. externa -Adventitia
The esophagus: 100X Mucosa Submucosa Muscularis externa Adventitia
The esophagus: 450X Mucosa Epithelium Lamina propria Muscularis mucosa Submucosa
The esophagus: 100X Adventitia Muscularis externa Submucosa Mucosa
The esophagus: 450X Muscularis externa Submucosa Muscularis mucosa Lamina propria Epithelium
The Stomach -Simple columnar epithelium -No villi -Epithelium all goblet cells -Glands are not obvious -Smooth muscle in m. externa
The stomach: 40X Muscularis externa: THREE layers - inner oblique, middle circular, outer longitudinal Submucosa Mucosa
Mucosa of the stomach: 450X Lamina propria: areolar c.t. Epithelium: all goblet cells Glands are NOT obvious
Mucosa & submucosa of the stomach: 450X Muscularis mucosa Gastric glands are NOT obvious Submucosa
Submucosa & muscularis externa of the stomach: 450X Muscularis mucosa Submucosa Muscularis externa
The Small Intestine -Villi -Simple tubular glands
The small intestine: 40X Villus Muscularis externa: -circular Submucosa Mucosa -longitudinal Intestinal glands
Villus of small intestine: 450X Lamina propria Epithelium
Mucosa & submucosa of the small intestine: 450X Intestinal gland Lamina propria Submucosa Mucosa Muscularis mucosa
Submucosa & muscularis externa of the small intestine: 450X inner circular layer
Muscularis externa of the small intestine: 450X inner circular layer Muscularis externa: outer longitudinal layer
Submucosal or Brunner’s glands of the duodenum: 100X Submucosa with submucosal glands Muscularis externa: inner circular layer
The Colon -No villi -Simple tubular glands -M. externa has “folds”
The colon: 40X Submucosa Muscularis externa: Mucosa
Mucosa of the colon: 450X Intestinal gland Epithelium Lamina propria
Mucosa & submucosa of the colon: 450X Intestinal gland Submucosa Mucosa Muscularis mucosa Lamina propria
The colon: 450X Muscularis externa -Inner circular layer: has these “funny” folds Submucosa Mucosa Muscularis mucosa
Muscularis externa of the colon: 450X -Inner circular layer: has these “funny” folds
Serosa & muscularis externa of the colon: 450X Inner circular layer Outer longitudinal layer Serosa
The Liver -Hepatic lobules -Central vein & sinusoids -Triads: -Bile ducts -Hepatic artery -Hepatic portal vein
The Liver: 40X Hepatic lobule
The Liver: 450X Central vein Hepatocytes Sinusoids
Triad of the Liver: 450X Hepatic portal vein Hepatic artery Bile duct
Triad of the Liver: 450X Hepatic artery Hepatic portal vein Bile duct
The Pancreas -Pancreatic acini -Pancreatic islets
The Pancreas: 40X Islet Acinous glands
The Pancreas: 450X Islet Acinous glands
The End Presentation & Photographs by Andrew W. Parsons Copyright 2000, All Rights Reserved.