The external anal sphincter (or sphincter ani externus) is a flat plane of skeletal muscle fibers, elliptical in shape and intimately adherent to the skin surrounding.
The human anus 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.
Circular muscles called the external sphincter ani form the wall of the anus and hold it closed. Glands release fluid into the anus to keep its.
Learn about the anal sphincter, a muscle that surrounds the anus and controls the release of stool from the rectum.
Rectal prolapse occurs when the rectum (the lower end of the large intestine) falls Weakening of the anal sphincter: This is the specific muscle that controls the.