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| 12. Digestive System | ||
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Mucosa of a dog colon.
In contrast to the mucosa of the small intestine, the mucosa of the colon does not show villi at its surface. The mucosa is composed exclusively of intestinal crypts. These crypts lie in a profuse lamina propria (*) rich in lymphoid cells. This lamina propria of the mucosa is separated from the submucosa by a thin muscularis mucosa (M). The crypts (arrows) are lined with numerous goblet cells, enterocytes and a few endocrine cells. All these cells derive from the undifferentiated cells located at the bottom of the crypts. Paneth cells are not present in the colon. Stain: H–E
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