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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.
Please send image use requests to coloncancer.guide@about.com
Illustration by Donna Myers © 2007
The serosa is the outmost layer of the colon. If you think of your colon as a garden hose, the serosa is the part of the hose that touches your hand. The serosa is also called the adventitia and its main purpose is to make sure your colon stays put while you move around.

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