what does the rectum do
The rectum is a component of the lower gastrointestinal tract. The rectum is a continuation of the sigmoid colon, and connects to the anus. The rectum follows the shape of the sacrum, and ends in an expanded section called the rectal ampulla.Unlike other portions of the colon, the rectum does not have taeniae coli.The rectum connects with the sigmoid colon at the level of S3, and connects with the anal canal as it passes through the pelvic floor muscles.Supports of the rectum include: 1  Pelvic floor formed by levator ani muscles.nlike other portions of the colon, the rectum does not have taeniae coli. The rectum connects with the sigmoid colon at the level of S3, and connects with the anal canal as it passes through the pelvic floor muscles. Supports of the rectum include: 1  Pelvic floor formed by levator ani muscles.
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.ts 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.