iliac colon

The left spermatic vein passes behind the iliac colon and is thus exposed to pressure from the contents of that part of the bowel.

Their branches supply the lower part of the descending colon, the iliac colon, and the sigmoid or pelvic colon; anastomosing above with the left colic, and below with the superior hemorrhoidal artery.

It begins at the superior aperture of the lesser pelvis, where it is continuous with the iliac colon, and passes transversely across the front of the sacrum to the left side of the pelvis.