1. Digestive
tract

3. Dark C
Taste pore
Light C
Taste bud

4. circumvallated papillae（HE） filiform and fungiform papillae （ HE）

5. Foliate papillae-taste bud （HE）
Tongue foliate papillae（HE）
Taste pore

6. ● mucous membrane of tongue
Lingual papillae: filiform, fungiform & circumvallated.
Tast bud: dark C, light C & basal C.

7. General structure of the wall
1.mucosa:
epithelium:
Lamina propria:
Muscularis mucosa:
2.submucosa:
3.Muscularis externa:
4.adventitia:

8. 4sub 1Epi. mucosa 2lamina propria 4esophageal glands 3 muscula
ris mucosa
5outer longi
tudinal M
5inner
circular M
6 adven
titia
Esophagus （HE）

9. epithelium
Esophageal gland
Esophagus

10. 2.sbumucosa: esophageal glands, mucous.
Esophagus
1.mucosa:
● Epi.: stratified squamous. Non-keratinized
● lamina propria: CT.
● muscularis mucosa: boudles of SMC.longitudinal
2.sbumucosa: esophageal glands, mucous.
3.muscularis: inner circular, outer longitudinal
4.adventitia: fibrosa.
upper1/3: skeletal M.
middle: mixed.
Lower1/3: smooth M.

11. Stomach

12. fundus

13. Stomach mucosa: submucosa: LCT.
Simple columnar Epi.: surface mucous cell
Lamina propria: gastric pit, gastric glands
Muscularis mucosa: inner circular, outer
longitudinal.
submucosa: LCT.
muscularis: inner oblique, middle circular, outer longitudinal.
Adventitia: serosa.

14. fundic glands location：lamina propria compositions： 1.Chief C
2.Parietal C
3.Neck mucous C
4.Endocrine C
5.Stem C

16. Chief cells Secretory granule nucleus rER LM: Lower columnar;
basophilic;
Nucleus located in the lower parts.
Secretory granules.
EM:
Gol , Apical of the nucleus;
mit. & rER ,basal part of cytoplasm;
Secretory granules, apical of cytoplasm.
Function : pepsinogen

17. Parietal cells microvilli LM: C large，cone-shaped or round.
nucleus
Introcellular canaliculi
Mitochondria
LM:
C large，cone-shaped or round.
acidophilic.
Nucleus is round ,centrical. EM
Introcellular secretory canaliculi & microvilli.
Tubulovesicular system.
Mit. are abundant.
functions:
Hcl & intrinsic factor.

19. duodenum
ileum
jejunum
small intestine

20. 1 striated
border
Central
lacteal
1 absorbtive C
SMC
2 goblet C
Cap.
5 stem C
Intestinal
gland
3 Paneth C
4 endocrine C

21. villi
folds
submucosa
muscularis
adventitia
Intestinal villi

22. microvilli
（striated border）

23. Small intestine mucosa:
Epi.: simple columnar, absorbtive C + goblet C.
Lamina propria: small intestinal gland ,central lacteal.
Muscularis mucosa: inner circular, outer longitudinal.
villi: the finger-like processes composed of epithelium layer and lamina propria protruding into the lumen .

24. submucosa
The duodenal gland, mucosa.
Circular folds: mucosa&submucosa protruding into the lumen . Appears as processes.
muscularis: inner circular,outer longitudinal .
adventitia: serosa.

25. @@@@@small intestinal gland
Absorbtive C
Goblet C
Endocrine C
Stem C
Paneth C
LM: the base of gland. arranged in groups of 3-5 cells .
in the apex, coarse acidophilic granules.
EM: protein-secreting cell.
functions: produce lysozyme.

26. Large intestinal

27. Epi. Lamina propria Large intestinal gland Muscularis mucosa
（goblet C）
Lamina propria
Muscularis mucosa
Mucosa of large intestine（HE）

28. Large intestine mucosa: no villi ,no circular folds.
Simple columnar Epi.: abundant goblet C.
Lamina propria: large intestinal glands, no paneth C.
Muscularis mucosa:

29. appendix No villi, intestinal gland Is scanty. Lamina propria:
abundant LT.
Serosa

30. The comparisons between mucosa of variant digestive tract （1）
Small
intestine
Large
intestine
esophagus
stomach
surface
Gastric
pit
villus
Striated
squamous
Simple
columnar
Simple columnar
Striated border
Goblet C
Simple
Columnar
Goblet C
abundant
Epi.

31. The comparisons between mucosa of variant digestive tract （2）
esophagus
stomach
Small intestine
Large
intestine
Lamina propria
No glands
Gastric gland
Small intestinal gland
Large intestinal gland
No L nodule
L nodule
L nodule abundant
lacteal
Fundic gland of stomach: chief , parietal, neck mucous , endocrine, stem C.
Small intestinal gland: absorbtive, goblet, paneth, endocrine, stem C.
Large intestinal gland: absorbtive, goblet, endocrine, stem C.

32. Key points
Structure characteristics of variant digestive tract. The similar and the different.
Esp, the variance of tunica mucosa. Such as , the villi and the glands.

33. Thank you !