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. This article describes four disorders that cause anal pain and irritation:. Anal fissure - An anal fissure, also called an anorectal fissure, is a linear split or tear in the lining "anoderm" of the lower anal canal.
What Causes Anal Swelling and How Can I Treat It?
Swollen Anus: Causes, Symptoms, and Treatment
Medically reviewed by Drugs. Last updated on Sep 10, 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.
Signs and Symptoms of Anal Cancer
Find an ACG member gastroenterologist with a specialized interest in liver disease. The rectum refers to the last four or five inches of the digestive tract. The rectal outlet or opening is called the anal canal or anus. Problems in this area are common, but many adults are too shy or embarrassed to ask their doctor about them.