It does not have the predictable branches of the internal iliac artery but its tributaries drain the same regions.

[3] Originating outside the pelvis, its tributaries are the gluteal, internal pudendal and obturator veins.

Coming from the pelvic plexuses and appropriate to gender are the middle rectal, vesical, prostatic, uterine and vaginal veins.

Damage to internal iliac vein tributaries during surgery can seriously compromise venous drainage and cause swelling of one or both legs.

[1] This article incorporates text in the public domain from page 673 of the 20th edition of Gray's Anatomy (1918)