The rectum is the last section of the digestive tube. It constitutes the extension of the sigmoid
, or pelvic, colon
, joining with the anal canal. On average, the rectum is 12 centimeters long, 5 cm of which is the rectal ampulla that can dilate to contain nearly 400 milliliters of matter before excretion. When a large quantity of excrement is held in the rectal ampulla, they exert pressure on the internal sphincter
, which relaxes, then immediately force the contraction of the external sphincter
, in order to keep the excrement contained. By releasing this external sphincter, bowel movement is then made possible. Rectoscopy is a medical procedure that allows the interior of the rectum to be visualized, performed by a proctologist
Original article published by
. Translated by Jeff
Latest update on October 26, 2016 at 08:57 AM by MarziaChiriatti.