When someone decides it's time (or the body decides for them), poop leaves the rectum, passes through the anal canal, and exits the body through the anus.
The anal canal is 2.5 - 4 centimeters long, depending on the person. Its upper half is comprised of anal columns, vertical folds of tissue. Its lower half is comprised of anal valves, folds of tissue that connect the bottoms of the anal columns together. The pectinate line runs underneath the anal valves.
The anal canal is 2.5 - 4 centimeters long, depending on the person. Its upper half is comprised of anal columns, vertical folds of tissue. Its lower half is comprised of anal valves, folds of tissue that connect the bottoms of the anal columns together. The pectinate line runs underneath the anal valves.
