Origin-lateral 2/3 of the inguinal ligament (lower fibers)* anterior 1/3 of the iliac crest (upper fibers)* middle 1/3 of the iliac crest (lateral fibers)Insertion-* pubic crest, pectineal line (lower fibers)* 10-12 ribs (lateral fibers)* linea alba (all portion)Innervation-iliohypogastric, ilioinguinal, and ventral rami nerves (T7-T12)Action-bilateral contraction:support of the abdominal viscera, posterior rotation of the pelvis, and flexion of the lumbar spineunilateral contraction:rotation of lumbar spine to same side, and lateral flexion of lumbar spine to same side

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