Lumbar Branch of Iliolumbar Artery
Ramus lumbalis arteriae iliolumbalis
Read moreQuick Facts
Origin: Iliolumbar artery from the posterior division of the internal iliac artery.
Course: Ascends anterior to psoas major and quadratus lumborum muscles.
Branches: Spinal branches.
Supplied Structures: Psoas major, psoas minor, and quadratus lumborum muscles, cauda equina.
Related parts of the anatomy
Origin
The lumbar branch of the iliolumbar artery is one of two branches of the iliolumbar artery, the other being the iliacus branch. The iliolumbar artery divides posterior to the medial border of psoas major muscle.
Course
The lumbar branch ascends to on the psoas major and quadratus lumborum muscles and extends to anastomose with the fourth lumbar artery.
Branches
The lumbar branch of iliolumbar artery sends small spinal branches to the intervertebral foramen.
Supplied Structures
The lumbar branch of the iliolumbar artery provides a blood supply to muscles such as psoas major and minor and quadratus lumborum muscles. Additionally, the spinal branches originating from the lumbar branch of iliolumbar artery supplies the cauda equina in the vertebral canal.
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Artery
When the artery is occluded blood is forced through the collateral vessels, drastically increasing fluid shear stress and triggering an inflammatory response which drives vessel remodeling.
