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Main > Medical Info > Organ Info > Anus Anus An anus is the opening of the rectum, colloquially known as the a**hole. Sphincter muscles make sure that it is closed unless it is time to defecate. Two sphincters – an internal and external control that process. The muscles of the internal sphincter are involuntary; however a person can control the muscles of the external sphincter. [Back to Organ Info]

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