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Updated: February 7, 2007

This is a cross section of the colon - the view you'd see if someone were to cut your colon in half.
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Illustration by Donna Myers © 2007

The mucosa is the innermost layer of the colon. Major components of the mucosa include a single layer of epithelial cells, a layer of connective tissue (the lamina propria), and a thin muscle layer (the lamina muscularis mucosae).

The mucosa is lined with goblet cells, which are glands that secrete mucus to help move material through the colon. When you get a colonoscopy or sigmoidoscopy, it's your mucosa that the doctor's inspecting for polyps.

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