Main Model
Subclavian artery
The left subclavian artery, the
third branch of the arch of the aorta, arises from the posterior part of the
arch, just posterior to the left common carotid artery. It ascends lateral to
the trachea and left common carotid artery through the superior mediastinum; it
has no branches in the mediastinum. As it leaves the thorax and enters the root
of the neck, it passes posterior to the left sternocostal joint.