The iliolumbar artery is derived from the posterior trunk of the internal iliac artery. It passes upward and lateral between the obturator nerve and the lumbosacral plexus. It is beneath the psoas major muscle and the external iliac vessels, lying close to the pelvic wall. It runs beneath the iliacus muscle to the upper part of the iliac fossa, where it divides into an iliac and a lumbar branch. The iliac branch supplies the iliacus muscle, and enters an oblique nutrient canal of the ilium to supply that bone. Other branches pass along the iliac crest to supply the adjacent portions of the abdominal and gluteal muscles. They anastomose with the circumflex iliac, lateral circumflex, and epigastric arteries. The lumbar branch ascends to supply the psoas major and quadratus lumborum muscles. It sends a small spinal branch through the lumbosacral intervertebral foramen to the spinal cord and its meninges. It anastomoses with the last lumbar artery.

Arteria iliolumbalis

Artère ilio-lombale