Sigmoid colon

Dr Henry Knipe et al.

The sigmoid colon is the continuation of the descending colon.

After the distal descending colon has curved medially it enters the pelvis, where it gains a mesentery and is then called the sigmoid colon. It measures approximately 15 cm in length. 

It has a "S" (Greek letter sigma) shape and has a variable length and course - its apex may be as high as the umbilicus. It lies on its own mesentery - the inverted V-shaped sigmoid mesocolon.

The sigmoid colon continues as the rectum when it loses its mesentery, at approximately S3. 

Relations
  • sympathetic: inferior mesenteric plexus 
  • parasympathetic: via pelvic splanchnic nerves (from S2-S4)

Lymphatics travel with vessels to the inferior mesenteric group.

Abdominal and pelvic anatomy
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Article Information

rID: 22754
Section: Anatomy
Tags: colon, cases
Synonyms or Alternate Spellings:

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