Written by the Fiveable Content Team • Last updated August 2025
Written by the Fiveable Content Team • Last updated August 2025
Definition
The external anal sphincter is a ring of muscle located at the end of the rectum that controls the passage of feces out of the body. It is voluntarily controlled, allowing individuals to decide when to defecate.
The final section of the large intestine that holds feces before they are expelled from the body.
Internal Anal Sphincter: A ring of involuntary smooth muscle that helps control the passage of feces out of the body, working in conjunction with the external anal sphincter.