Course
The internal thoracic artery arises from the subclavian artery near its origin.
It travels downward on the inside of the ribcage, approximately a centimeter from the sides of the sternum, and thus medial to the nipple. It is accompanied by the internal thoracic vein.
It runs deep to the internal intercostal muscles, but superficial to the transverse thoracic muscles.
It continues downward until it divides into the musculophrenic artery and the superior epigastric artery around the sixth intercostal space.
Read more about this topic: Internal Thoracic Artery