INTERNAL THORACIC ARTERY (Internal mammary artery)

 

ORIGIN: Subclavian artery.

COURSE/DISTRIBUTION:  This artery takes its origin from the subclavian artery at its first part, opposite the thyrocervical trunk at the sternoclavicular junction. It emerges from the inferior surface of the first part of the subclavian artery and runs a straight and downward course behind the upper 6 costal cartilages a little lateral to the sternal lateral border. At the level of the 6th costal cartilage it divides into its terminal branches- musculophrenic artery and the superior epigastric artery.

BRANCHES:

  • Pericardiocophrenic artery
  • Mediastinal and thymic arteries
  • Pericardial branches
  • Perforating arteries
  • Sternal branches
  • Anterior intercostal arteries
  • Musculophrenic artery
  • Superior epigastric artery.

 

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