Quadratus Lumborum
Muscular System
The quadratus lumborum (QL) is a quadrilateral, deep muscle of the posterior abdominal wall, lying between the last rib, lumbar spine, and pelvis.
Attachments and Innervation
- Origin: the posterior iliac crest and iliolumbar ligament.
- Insertion: the twelfth rib and the transverse processes of L1–L4.
- Nerve: anterior rami of T12 and L1–L4.
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