Iliolumbar artery

The iliolumbar artery (latin: arteria iliolumbalis) is a branch of the posterior trunk of the internal iliac artery.

The iliolumbar artery ascends and crosses the sacroiliac joint and the lumbosacral trunk ventrally, then it passes along the medial border of the psoas major, where it divides into two terminal branches: the lumbar and iliac branches.

The lumbar branch of the iliolumbar artery runs posteriorly and supplies the psoas major and quadratus lumborum muscles.

The iliac branch of the iliolumbar artery passes dorsally and supplies the iliacus muscle and the abdominal muscles.