Common iliac vein
The common iliac vein forms in the abdomen region of the fifth lumbar vertebrae. It divides into two branches. The internal iliac vein supplies blood to the visceral organs in the pelvic region. The external iliac connects to the femoral veins. Both veins join together to form the inferior vena cava. Veins located in the organs of the pelvic area receive the interior iliac vein. The vein receives blood from the reproductive organs. The internal iliac vein may double or lay lateral to the external iliac vein. The veins form a network known as the plexuses. Plexuses are located in the anus, prostate glands, and urinary bladder in males. Plexuses are found in the vagina and the uterus in females. The external iliac vein is located in the lower leg. The vein begins behind the inguinal ligament. The vein passes through the pelvis and ends opposite the sacroiliac articulation. The external iliac vein receives three veins: the pubic, inferior epigastric, and deep iliac circumflex veins. The internal iliac vein is the hypogastric vein. At the brim of the pelvis it joins the external iliac vein to form the common iliac vein.
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In Depth: Common iliac vein