Quadratus Lumborum

This article is a stub.

The left quadratus lumborum, one of the posterior abdominal muscles, is depicted in red.
Quadratus Lumborum
Muscle Type
Origin	Posterior border of iliac crest
Insertion	Inferior border of 12th rib and L1-L5
Action	Alone(unilateral), lateral flexion of vertebral column; Together (bilateral), depression of thoracic rib cage
Synergists
Antagonists
Spinal innervation	T12, L1, L2, L3, L4
Peripheral Innervation	The twelfth thoracic and first through fourth ventral rami of lumbar nerves
Vasculature	Lumbar arteries, lumbar branch of iliolumbar artery