EXTERNAL ABDOMINAL OBLIQUE

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