JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Rectum. Artwork of the musculature of the rectum, the final part of the human digestive system. The rectum stores faeces from the large intestine. The muscles hold them in place until evacuation is needed. The exit route is the anus, a sphincter of tight muscles forming the ring at lower centre. If these muscles are weakened or injured, then the rectum may protrude from the body, a condition known as a prolapsed rectum (not seen here). The anal sphincter relaxes to allow the passage of the faeces during an evacuation of the bowels.
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