Please confirm that you are not located inside the Russian Federation
The link you have selected will take you to a third-party website. We do not control or have responsibility for the content of any third-party site.
Enter search terms to find related medical topics, multimedia and more.
In this photo, the rectal lining (rectal mucosa) is visible outside the body as a dark red, moist projection from the anus (the opening at the end of the digestive tract where stool leaves the body).
SCIENCE PHOTO LIBRARY