Muscle Origin

Attaches to the sternum and xiphoid process anteriorly, the L1 through the L3 lumbar vertebrae and the arcuate ligaments posteriorly, and the costal margin peripherally.

Circular muscle dividing the thoracic and abdominal cavities.anatomy-model- 053-edited 3


Attaches to the central aponeurotic tendon.

The central tendon of the diaphragm is a thin but strong aponeurosis situated slightly anterior to the vault formed by the muscle, resulting in longer posterior muscle fibers. Wiki


Contraction causes it to flatten out, pulling down the lungs for inhalation.

Inspiration; During inspiration (breathing in), the diaphragm contracts, drawing downward, creating a vacuum in the thoracic cavity.

Innervation – Nerve control

Phrenic and lower intercostal nerves.

Phrenic, inferior phrenic, subcostal and inferior six – seven intercostal nerves.


Pericardiacophrenic artery, Musculophrenic artery, Inferior phrenic arteries.

The pericardiacophrenic artery is a long slender branch of the internal thoracic artery. It accompanies the phrenic nerve, between the pleura and pericardium, to the diaphragm, to which it is distributed. It anastomoses with the musculophrenic and inferior phrenic arteries. Wiki

Antagonist muscles


Pictures of muscles


Trigger Point Referrals


Stretching description








Additional Resources

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