The brachiocephalic trunk, the first and largest branch
of the arch of the aorta, arises posterior to the manubrium,
where it is anterior to the trachea and posterior to the left
brachiocephalic vein.
The trunk ascends superolaterally to reach the right side of
the trachea and the right SC joint, where it divides into the
right common carotid and right subclavian arteries.