sigmoid mesocolon /mez″ōkō″lən/ [Gk, sigma + eidos + mesos, middle, kolon] , a fold of peritoneum that connects the sigmoid colon with the pelvic wall, forming a curved line of attachment with the apex of the curve located at the division of the left common iliac artery. The fold is continuous with the iliac mesocolon and ends in the median plane over the rectum at the level of the third sacral vertebra. Between the two layers of the fold are the sigmoid and the superior rectal vessels. Compare mesentery proper, transverse mesocolon.
