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Revision as of 19:18, 6 September 2003 by Angela (talk | contribs) (Reverted to last edit by Rob Hooft)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)The anus, in anatomy, is the external opening of the rectum. It is controlled by sphincter muscles. Faeces are expelled from the body through the anus during the act of defecation, which is the primary function of the anus.