1. 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
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2. 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.

3. The Esophagus -Stratified squamous epithelium
-Skeletal muscle in m. externa
-Adventitia

4. The esophagus: 100X
Mucosa
Submucosa
Muscularis externa
Adventitia

5. The esophagus: 450X Mucosa Epithelium Lamina propria Muscularis mucosa
Submucosa

6. The esophagus: 100X
Adventitia
Muscularis externa
Submucosa
Mucosa

7. The esophagus: 450X Muscularis externa Submucosa Muscularis mucosa
Lamina propria
Epithelium

8. The Stomach -Simple columnar epithelium -No villi
-Epithelium all goblet cells
-Glands are not obvious
-Smooth muscle in m. externa

9. The stomach: 40X Muscularis externa: THREE layers - inner oblique,
middle circular,
outer longitudinal
Submucosa
Mucosa

10. Mucosa of the stomach: 450X
Lamina propria: areolar c.t.
Epithelium: all goblet cells
Glands are NOT obvious

11. Mucosa & submucosa of the stomach: 450X
Muscularis mucosa
Gastric glands are NOT obvious
Submucosa

12. Submucosa & muscularis externa of the stomach: 450X
Muscularis mucosa
Submucosa
Muscularis externa

13. The Small Intestine
-Villi
-Simple tubular glands

14. The small intestine: 40X Villus Muscularis externa: -circular
Submucosa
Mucosa
-longitudinal
Intestinal glands

15. Villus of small intestine: 450X
Lamina propria
Epithelium

16. Mucosa & submucosa of the small intestine: 450X
Intestinal gland
Lamina propria
Submucosa
Mucosa
Muscularis
mucosa

17. Submucosa & muscularis externa of the small intestine: 450X
inner circular layer

18. Muscularis externa of the small intestine: 450X
inner circular layer
Muscularis externa:
outer longitudinal layer

19. Submucosal or Brunner’s glands of the duodenum: 100X
Submucosa with
submucosal glands
Muscularis externa:
inner circular layer

20. The Colon
-No villi
-Simple tubular glands
-M. externa has “folds”

21. The colon: 40X
Submucosa
Muscularis externa:
Mucosa

22. Mucosa of the colon: 450X
Intestinal gland
Epithelium
Lamina propria

23. Mucosa & submucosa of the colon: 450X
Intestinal gland
Submucosa
Mucosa
Muscularis
mucosa
Lamina propria

24. The colon: 450X Muscularis externa -Inner circular layer:
has these “funny” folds
Submucosa
Mucosa
Muscularis
mucosa

25. Muscularis externa of the colon: 450X
-Inner circular layer:
has these “funny” folds

26. Serosa & muscularis externa of the colon: 450X
Inner circular layer
Outer longitudinal layer
Serosa

27. The Liver -Hepatic lobules -Central vein & sinusoids -Triads:
-Bile ducts
-Hepatic artery
-Hepatic portal vein

28. The Liver: 40X
Hepatic lobule

29. The Liver: 450X
Central vein
Hepatocytes
Sinusoids

30. Triad of the Liver: 450X
Hepatic portal vein
Hepatic artery
Bile duct

31. Triad of the Liver: 450X
Hepatic artery
Hepatic portal vein
Bile duct

32. The Pancreas
-Pancreatic acini
-Pancreatic islets

33. The Pancreas: 40X
Islet
Acinous glands

34. The Pancreas: 450X
Islet
Acinous glands

35. The End Presentation & Photographs by Andrew W. Parsons
Copyright 2000, All Rights Reserved.