<prompt> Thyrocervical trunk is branch of1st2nd3rdNone  <response>: The thyrocervical trunk is a sho, wide vessel which arises from the front of the first subclan aery, close to the medial border of scalenus anterior and between the phrenic and vagus nerve. It almost immediately divides into inferior thyroid, suprascapular, transverse cervical aeries Ref BDC volume3,sixth edition pg 150 