Sigmoid colon

Organs · Latin: Colon sigmoideum

Open in 3D

The sigmoid colon (or pelvic colon) is the part of the large intestine that is closest to the rectum and anus.

It forms a loop that averages about 35–40 centimetres (14–16 in) in length.

The loop is typically shaped like a Greek letter sigma (ς) or Latin letter S (thus sigma + -oid).

This part of the colon normally lies within the pelvis, but due to its freedom of movement it is liable to be displaced into the abdominal cavity.

Definition from Wikipedia, CC BY-SA 4.0.