The thyrocervical trunk is a short thick trunk. It arises from the upper border of the subclavian artery near the medial border of the scalenus anterior muscle. It lies beneath the internal jugular vein and prevertebral fascia and between the phrenic nerve and the vertebral vein, ascending for two to ten millimeters and then dividing into three branches: the inferior thyroid, suprascapular, and transverse cervical arteries.

Truncus thyrocervicalis

Tronc thyro-cervical