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. The lower half of the anal canal has sensitive nerve endings. There are blood vessels under the lining, and in its mid portion there are numerous tiny, anal glands.
Anal Fissure, Abscess and Fistula
Perianal abscess, anal fistula, and anal fissure | The Surgery Group
The anal canal makes up the last inch and a half of your bowel. There are a number of common problems that can occur in this area, where your digestive system leaves your body. These issues can cause pain and discomfort that sometimes need to be addressed surgically. Three common and painful conditions that can affect the anus are an anal fissure, perianal abscess, and anal fistula. Anal fissures are small tears in the lining of the anus. They can be extremely painful during and immediately after defecation because of how the muscle ring around the anus expands. Abscesses are localized pockets of pus that are caused by bacterial infections.
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An anal abscess is an infected cavity filled with pus found near the anus or rectum. Ninety percent of abscesses are the result of an acute infection in the internal glands of the anus. Occasionally, bacteria, fecal material or foreign matter can clog an anal gland and tunnel into the tissue around the anus or rectum, where it may then collect in a cavity called an abscess. An anal fistula also commonly called fistula-in-ano is frequently the result of a previous or current anal abscess.