The anus is the opening at the end of the digestive tract where stool leaves the body. The rectum is the section of the digestive tract above the anus where stool is held before it passes out of the body through the anus. The anus is formed partly from the surface layers of the body, including the skin, and partly from the intestine. The rectal lining consists of glistening red tissue containing mucus glands—much like the rest of the intestinal lining. The lining of the rectum is relatively insensitive to pain, but the nerves from the anus and nearby external skin are very sensitive to pain.
Hemorrhoids | University of Iowa Hospitals & Clinics
An imperforate anus or anorectal malformations ARMs are birth defects in which the rectum is malformed. ARMs are a spectrum of different congenital anomalies in males and females which vary from fairly minor lesions to complex anomalies. There are several forms of imperforate anus and anorectal malformations. The new classification is in relation of the type of associated fistula. Imperforate anus is usually present along with other birth defects— spinal problems, heart problems, tracheoesophageal fistula , esophageal atresia , renal anomalies and limb anomalies are among the possibilities, collectively being called the VACTERL association.
Rectal and Large Intestinal Atresia / Stenosis (also called anal atresia)
Jump to content. Rectal prolapse occurs when part or all of the wall of the rectum slides out of place, sometimes sticking out of the anus. See a picture of rectal prolapse.
Rectal and large intestinal atresia or stenosis is the term used to describe a group of rare congenital conditions of the lower gastro-intestinal tract bowel. It can range from absence of these structures to malformations of the anus and rectum called colon, rectum or anal atresia. In anal stenosis the anus will look normal externally but it will not be connected to the bowel.