Lumbar branch of iliolumbar artery

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Artery: Lumbar branch of iliolumbar artery
Gray585.png
The veins of the right half of the male pelvis. (Iliolumbar artery not labeled, but Iliolumbar vein visible at center right.)
Latin ramus lumbalis arteriae iliolumbalis
Gray's p.621

The lumbar branch of the iliolumbar artery (ramus lumbalis) supplies the psoas major and quadratus lumborum, anastomoses with the last lumbar artery, and sends a small spinal branch through the intervertebral foramen between the last lumbar vertebra and the sacrum, into the vertebral canal to supply the cauda equina.