Anal sphincter anatomy
The muscles in the anal sphincter are used in the process of defecation.
Update Date: 5/22/2008 Updated by: Scott M. Gilbert, MD, Department of Urology, Columbia-Presbyterian Medical Center, New York, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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