Vertebral:crura from bodies of L1, 2 (left), L1-3(right). Costal: med and lat arcuate ligs, inner aspect of lower six ribs . Sternal: two slips from post aspect of xiphoid
Action
Inspiration and assists in raising intra-abdominal pressure
Insertion
Trefoil central tendon
Nerve
Phrenic N (motor) (C3, 4, 5). Sensory: phrenic, intercostals(6-12) and upper two lumbar N roots
