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    Rectum, Anus, and Anal Sphincter

    Rectum, Anus, and Anal Sphincter

    The rectum is a muscular tube about 5 in. (12.7 cm) long that is at the end of the large intestine (colon). The rectum connects the colon to the anus, which is the opening where stool exits the body.

    The internal and external anal sphincters are rings of muscle at the opening of the anus. The sphincters keeps the anus closed as stool collects in the rectum. Eventually the pressure on the rectum wall causes the internal anal sphincter to relax. Conscious control over the external anal sphincter allows stool to pass out of the body through the anus.

    Last Revised: May 15, 2012

    Author: Healthwise Staff

    Medical Review: Anne C. Poinier, MD - Internal Medicine & C. Dale Mercer, MD, FRCSC, FACS - General Surgery

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