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Muscle Origin Insertion Action Nerve
Quadratus lumborum Transerve processes of L3-L5; iliolumbar ligament; iliac crest Lower border of last rib; transverse processes of L1-L3 Depresses rib 12; flexes trunk laterally Subcostal nerve; L1-L3
Psoas major Transverse processes, intervertebral disks & bodies of T12-L5 Lesser trochanter Flexes thigh & trunk, lateral rotation of femur L2-L3
Psoas minor Bodies & intervertebral discs of T12-L1 Pectineal line; iliopentineal eminence Aids in flexing of trunk L1

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