A colon and rectal surgeon diagnoses and treats various diseases of the intestinal tract, colon, rectum, anal canal and perianal area.

The opening through which waste matter is excreted.
Mucous membranes. In this case, it refers to the mucosa of the rectum.
The rectum connects the lower intestine to the anal canal. Transverse folds in the rectum help keep the waste matter (stool) in place until it is ready to be passed.
A hemorrhoid is an enlarged or swollen blood vessel, either located in the rectum, anal canal or extending from the anus. They may be painful, itchy and bleed. Although many hemorrhoids can be treated at home using stool softeners (Colace, etc.), bulk laxatives (Metamucil, Citrucel, etc.), and warm tub baths, many require further attention. You should always have rectal bleeding evaluated to ensure it is nothing serious.
Procedure for Prolapse and Hemorrhoids (PPH) is an innovative procedure that has been found to be effective in treating severe hemorrhoids or for those that have not responded to non-surgical treatment. It is also effective for rectal mucosal prolapse, which is when part of the rectum lining (mucous membrane) slides out of place and protrudes out of the anus.
PPH uses a hemorrhoidal circular stapler device to remove hemorrhoidal tissues and close the wound. Once this is done, blood flow is reduced to the internal hemorrhoid(s) and they usually shrink within four to six weeks. Or, in the case of mucosal prolapse, the stapler device is used to lift up or reposition the mucosa to restore anal tissue to its original position.