subclavian artery Thyrocervical trunk 3990 Thyrocervical trunk Trunk of thyrocervical artery Trunk of branch of subclavian artery, each instance of which arises superiorly from some subclavian artery just medial to some anterior scalene muscle and at once gives rise to the trunks of some inferior thyroid, transverse cervical, and suprascapular arteries, supplying some thyroid, neck, and scapular regions. Tronc thyro-cervical fma:fma3990 FMA:3990 Truncus thyrocervicalis thyrocervical trunk AS Systemic arterial trunk