The internal iliac vein is formed by tributaries which have the same course as the branches of the internal iliac artery, with the exception that it receives no vein which corresponds to the obliterated umbilical artery. It receives blood from the exterior of the pelvis; also from the organs in the cavity of the pelvis through the hemorrhoidal and vesicoprostatic plexus in the male, and through the vaginal and uterovaginal plexuses in the female. The internal iliac vein terminates opposite the sacroiliac articulation, where it unites with the external iliac vein to form the common iliac vein. In its course it lies at first on the medial side of, and then behind the internal iliac artery. It contains no valves.

Vena iliaca interna

Veine iliaque interne