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Diagram of the Rectum

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Updated: September 14, 2006

The rectum is about eight inches long and serves, basically, as a warehouse for poop.
Diagram of the Rectum, © Donna Myers 2006 (coloncancer.guide@about.com)

Rectum

© Donna Myers 2006
The rectum has little shelves in it called transverse folds. These folds help keep stool in place until you're ready to go to the bathroom. When you're ready, stool enters the lower rectum, moves into the anal canal, and then passes through the anus on its way out.
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