the digestive tract is a long, continuous tube of varying diameter extending from the lips to the...
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The digestive tract is a long, continuous tube of va
rying diameter extending from the lips to the anus. It i
ncludes oral cavity,esophagus, stomach, small intestin
es, large intestine and appendix.
The oral cavity
The oral cavity is lined by mucosa. There are a ton
gue and 32 permanent teeth in the oral cavity.
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Fig. 1.
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Fig. 2.
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Except the oral cavity, the wall of the digesti
ve tract consists of four layers: mucosa, submuc
osa, muscularis and adventitia. The mucosa cons
ists of epithelium, lamina propria and muscularis
mucosa.
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Fig . 3 . Cross section of esophagus(HE stain,low mag.)
Tunicamuscularis
submucosa
mucosa
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Fig . 4 . Stomach (HE stain,low mag.)
mucosa
submucosa
Tunicamusculari
s
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Fig . 5 . Stomach(HE stain,high mag.)
Gastric pit
Gastric gland
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Parietal cell
Parietal cell
Neck mucous
cell
Fig . 6 The mucosa of gastric fundus : fundic glands
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Fig 7. Parietal cell
Active cell
Resting cell
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Fig. 8 parietal cell
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Chief cellsChief cells
Fig . 9 The mucosa of gastric fundus : fundic glands
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Fig. 10
Chief cell
ZG:
Zymogen gr
anules
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The small intestines include duodenum ,
jejunum and ileum. There are plica circulare
s and villi on the mucosa of the small intesti
nes.
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Villus
Fig . 11 Small intestine (jejunum)
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Striated border
Fig . 12 Villus of small intestine(HE stain ,high mag.)
Central lacteal
Goblet cell
Columnar cell
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Fig . 13 Villus of small intestine(HE stain ,high mag.)
Central lacteal
Striated border
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Fig. 14 absorptive cell
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Fig . 15 small intestine gland
Paneth cell:
acidophilic granules
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Fig. 16 P
aneth cell:
Secretory gr
anules
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Fig . 11 Longitudinal section of Colon(HE stain,low mag.)
Tunica muscularis
mucosa
submucosa
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Intestinal gland
epithelium
Fig 12 Mucosa of Colon (HE stain,high mag.)
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Fig 13 Mucosa of Colon (HE stain,high mag.)
Intestinal gland
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Fig . 14 Cross section of appendix(HE stain ,low mag.)
Arrowhead:lymphoid nodule
Intestinal gland
muscularis mucosa