EXTERNAL ABDOMINAL OBLIQUE
| ORIGIN Anterior angles of lower eight ribs |
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| INSERTION Outer anterior half of iliac crest, inguinal lig, public tubercle and crest, and aponeurosis of anterior rectus sheath |
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| ACTION Supports abdominal wall, assists forced expiration, aids raising intraabdominal pressure and, with muscles of opposite side, abducts and rotates trunk |
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| NERVE Anterior primary rami (T7-12) |