September 09, 2010
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Posterior abdominal wall

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MuscleOriginInsertionActionNerve
Quadratus lumborumTranserve processes of L3-L5; iliolumbar ligament; iliac crestLower border of last rib; transverse processes of L1-L3Depresses rib 12; flexes trunk laterallySubcostal nerve; L1-L3
Psoas majorTransverse processes, intervertebral disks & bodies of T12-L5Lesser trochanterFlexes thigh & trunk, lateral rotation of femurL2-L3
Psoas minorBodies & intervertebral discs of T12-L1Pectineal line; iliopentineal eminenceAids in flexing of trunkL1
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