Identify the vessels. 1. Inferior Vena Cava 2. Abdominal Aorta 3. Iliolumbar artery 4. External Iliac 5. Internal Iliac
The iliolumbar arteries are named for their location, supplying blood to the lumbar region of the back and the ilium of the of the pelvis. They branch from the abdominal aorta just above where it splits into the external and internal iliac arteries.