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Diagram of the Anal Canal

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Updated: September 14, 2006

The anal canal is the last stop for poop before it sees the light of day.
Diagram of the Anal Canal, © Donna Myers 2006 (coloncancer.guide@about.com)

Anal Canal

© Donna Myers 2006
When someone decides it's time (or the body decides for them), poop leaves the rectum, passes through the anal canal, and exits the body through the anus.

The anal canal is 2.5 - 4 centimeters long, depending on the person. Its upper half is comprised of anal columns, vertical folds of tissue. Its lower half is comprised of anal valves, folds of tissue that connect the bottoms of the anal columns together. The pectinate line runs underneath the anal valves.
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