I cycle with a bloke who is a physician and he told me the following Interesting Fact about the rectum: the rectum is equipped with nerves, which allow the brain to distinguish between liquid, solid or gaseous contents, thus allowing you to release the contents at the appropriate time and place. The problems start when the nerves of the lower spine are damged in an accident and those discriminatory signals can no longer reach the brain..... back injury sufferers can become housebound out of fear of accidents away from home.