The human anus from Latin anus meaning "ring", "circle" [1] [2] 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. Attitudes towards anal sex vary and it is illegal in some countries. The anus is also the site of potential infections and other conditions, including cancer. The anus is the final component of the gastrointestinal tract , and directly continues from the rectum.
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The anus is the endpoint of the gastrointestinal, or GI, tract. It is where stool exits the body. A person may wish to better understand their symptoms by touching the anus and surrounding area. It is crucial to wash the hands before and after doing so to prevent the spread of bacteria. Anal fissures are small cuts or tears that occur in or on the anus. If an anal fissure is not showing signs of healing, a doctor might recommend Botox injections or a simple surgical procedure called a sphincterotomy.
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