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Updated February 16, 2010

Definition: The anus is the opening of the rectum. It allows waste to pass from the large intestine and outside the body.

The anus is often confused with the rectum, which is the last several inches of the lower intestine. The rectum ultimately ends at the anus, where fecal material exits the body.

The anus is vulnerable to infections and diseases, such as anal cancer.

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