Another is the left common iliac vein, which crosses the midline at approximately vertebral level LV to join with its partner on the right to form the inferior vena cava. These veins drain the lower limbs, the pelvis, the perineum, and parts of the abdominal wall.
Other vessels crossing the midline include the left lumbar veins, which drain the back and posterior abdominal wall on the left side.
All venous drainage from the through the liver