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Musculophrenic arteries (anatomy)

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The musculophrenic artery:

  • is a distal branch of the respective internal thoracic artery on each side
  • is formed from a retrosternal division of each internal thoracic artery at the level of the 6th intercostal space
  • passes inferolaterally in the recess between the surface of the thoracic diaphragm and the posterior surface of the anterior thorax
  • on route, provides two anterior intercostal arteries for each of intercostal spaces 7 to 9 and partly supplies pericardium
  • traverses diaphragm at level of 9th costal cartilage to supply and ramify on its abdominal surface

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