origin: from bondies of the 5th, 6th, and 7th cervical and the 1st, 2nd and 3rd thoracic vertebrae, with the slips from transverse processes;
insertion: bodies of 2nd, 3rd, and 4th cervicals with slips to transverse processes;
action: acting bilaterally, flexes cervical vertebrae; acting unilaterally, assists in rotation and lateral flexion;
synergists: scalenus group, sterncleidomastoid, Longus Capitis, suprahyoid, infrahyoid and the platysma
Original Text by Clifford R. Wheeless, III, MD.
Last updated by Data Trace Staff on Friday, August 12, 2011 1:51 pm