Quadratus lumborum muscle

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The quadratus lumborum is a muscle located in the abdomen, in the lower back. The quadratus lumborum muscle is quadrilateral in shape. It is surrounded by a very powerful fibrous membrane. The quadratus lumborum is connected to the 12th rib, the L1 to L4 lumbars, the iliac crest of the pelvis, and the ilio-lumbar ligament. The first three lumbar nerves and the subcostal nerve supply it with innervation. The quadratus lumborum enables side-to-side movement of the pelvis and trunk.