Scalenus Posterior

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 mediusScalenus AnteriorSternocleidomastoidLongus 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