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- The internal abdominal oblique attaches from the inguinal ligament, iliac crest, and thoracolumbar fascia to the lower three ribs and the abdominal aponeurosis.
- The internal abdominal oblique flexes, laterally flexes, and ipsilaterally rotates the trunk at the spinal joints.
- It also posteriorly tilts and contralaterally rotates the pelvis and elevates the same-side pelvis at the lumbosacral joint.
- The internal abdominal oblique also compresses the abdominal contents.