describe where the rectum is located
Rectum. The rectum is the concluding part of the large intestine that terminates in the anus. The average length of the human rectum may range between 10 and 15 cm.Its diameter can be compared to that of the sigmoid colon (the part of the large intestine nearest the rectum) at its onset.However, it becomes larger near the anus, where it forms the rectal ampulla. The key role of the rectal ampulla is to act as a temporary storehouse for feces.ertain types of cancers may be diagnosed by performing an endoscopy in the rectum. An endoscopy is a procedure where a doctor uses an endoscope â a small, flexible tube with a camera and light â to examine areas inside the body.