We know that the subclavian artery brings oxygenated blood from the heart toward the arm, and splits into some other arteries like the vertebral artery, internal thoracic artery and the dorsal scapular artery.
After those other arteries split off from the subclavian artery, it keeps going and turns into the axillary artery.
This brings blood to parts of the chest, the armpit and the upper arm.
(from: wikipedia - axillary artery)
Kid Facts - Blast from the past: Trachea
