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;
