origin: posterior tubercles of transverse processes of 4th, 5th, and 6th cervicals;
insertion: lateral superior surfaces of 2nd rib behind attachment of Serratus Anterior;
action: acting unilaterally, flexes and rotates cervical vertebrae; when acting bilaterally, flexes the neck and raises 2nd rib;
nerve supply: posterior branches of C5 , C6 , C7, C8 , lateral musclular branch of C3, and C4;
synergists: Scalenus medius, Scalenus Anterior, Sternocleidomastoid, Longus Capitis, longus coli, suprahyoid, infrahyoid, and platysma
Original Text by Clifford R. Wheeless, III, MD.
Last updated by Data Trace Staff on Tuesday, August 16, 2011 1:11 pm