NCIt definition : The portion of the colon that connects to the descending colon above and the rectum
below.;
Alternative definition : CDISC: The portion of the colon that connects to the descending colon above and the
rectum below. (NCI); NCI-GLOSS: The S-shaped section of the colon that connects to the rectum.; UBERON: The part of the large intestine that is closest to the rectum and anus. It
forms a loop that averages about 40 cm. in length, and normally lies within the pelvis,
but on account of its freedom of movement it is liable to be displaced into the abdominal
cavity.;