See sphincter.

Strong muscles that form a valve. The anal sphincter muscles relax when a bowel movement occurs….

Strong muscles that form a valve. The urethral sphincter helps control the release of urine from the body. An artificial sphincter can aid people with incontinence….

The opening at the end of the bowel where solid waste matter normally leaves the body. The muscles that control it are called the anal sphincter.

A rare cancer affecting the tissues of the anus.

An operation for rectal cancer, which involves removing part of the colon and the rectum and anus and creating a permanent colostomy. Also used for anal cancer.