The anus is part of the digestive system. Stool leaves the body through the anus. It is the opening at the end of the large intestine after the rectum. The area around the anus is called the anal region.
Overview of the Anus and Rectum
Anal Disorders - Harvard Health
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:.
Anatomy of the Anus
The anus is the opening at the end of the digestive tract where stool leaves the body. The rectum is the section of the digestive tract above the anus where stool is held before it passes out of the body through the anus. The anus is formed partly from the surface layers of the body, including the skin, and partly from the intestine. The rectal lining consists of glistening red tissue containing mucus glands—much like the rest of the intestinal lining.
The anus is connected to the rectum by the anal canal. The anal verge is where the canal connects to the outside skin at the anus. The inner lining of the anal canal is the mucosa.