Curtis Asbury, MD sees it all the time. Peering into their sore bottom, Asbury nods solemnly, then delivers news most people never expect to hear. A dermatologist practicing in Selbyville, Delaware, Asbury has seen an uptick in the number of people coming in expressing dissatisfaction with their rectal hygiene. And the consequences can be irritating. In an attempt to clean their rear end, some people scrub so violently that the American Society of Colon and Rectal Surgeons has given a name to the resulting tenderness: Polished Anus Syndrome, or PAS. Fortunately, the key to avoiding PAS and other rectal misadventures is relatively easy.
In humans , the anus from Latin anus meaning "ring", "circle"   is the external opening of the rectum. Two sphincters control the exit of feces from the body during an act of defecation , which is the primary function of the anus. These are the internal anal sphincter and the external anal sphincter , which are circular muscles that normally maintain constriction of the orifice and which relaxes as required by normal physiological functioning. The inner sphincter is involuntary and the outer is voluntary. It is located behind the perineum which is located behind the vagina or scrotum. With anal sex , the anus can play a role in sexuality.
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Related to anus: hemorrhoids. All rights reserved. Copyright , , by Random House, Inc.
Medically reviewed by Drugs. Last updated on Aug 31, The anus is that part of the intestinal tract that passes through the muscular canal of the pelvis and anal sphincters. It is the final orifice through which stool passes out of the body. In adults, the anus is 4 to 5 centimeters long.
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