Human Anatomy: Muscle Groups

Human Anatomy

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Muscle Function & Other Pertinent Medical Information
ORIGIN: Vertebral:crura from bodies of L1, 2 (left), L1-3 (right). Costal: medial and lateral arcuate ligs, inner aspect of lower six ribs . Sternal: two slips from posterior aspect of xiphoid
INSERTION: Central tendon
ACTION: Inspiration and assists in raising intra-abdominal pressure
NERVE: Phrenic nerve (motor) (C3, 4, 5). Sensory: phrenic, intercostals (6-12) and upper two lumbar nerve roots

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