Quadratus Lumborum

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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
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