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Origin-* 5-8 ribs (anterior fibers)* 9-12 ribs (lateral fibers)Insertion-* via an aponeurosis to the linea alba (anterior fibers)* anterior superior iliac spine, pubic tubercle, and the anterior portion of the iliac crest (lateral fibers)Innervation-iliohypogastric, ilioinguinal, and ventral rami nerves (T1-T12)Action-bilateral contractions:flexion of lumbar spine, and posterior rotation of the pelvisunilateral contractions:rotation of lumbar spine to opposite side, and lateral flexion of the lumbar spine to same side
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