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Revision as of 17:45, 4 November 2002 by Ed Poor (talk | contribs) (I question the relevance of this)(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.