The costocervical trunk arises from the upper margin of the second portion of the subclavian artery, and occasionally from the first portion upon the left side. It arches backward and a little upward over the pleura, and then descends behind it, giving off the deep cervical artery. It then passes in front of the neck of the first, and sometimes of the second rib, giving off the arteries of the first, and sometimes of the second intercostal space, and a posterior branch.

Truncus costocervicalis

Tronc costo-cervical