origin: transverse process of 1st 4 cervical vertebrae
insertion: vertebral border of scapula between superior medial angle and scapular spine;
action: elevates scapula to inferiorly rotate glenoid cavity; working with the upper Trapezius , elevates and adducts scapula;
reversed origin insertion action: when scapula is fixed, laterally flexes and slightly rotates cervical spine;
nerve supply: dorsal scapula, C3, C4, C5;
synergists: rhomboid and Trapezius
Original Text by Clifford R. Wheeless, III, MD.
Last updated by Data Trace Staff on Saturday, December 3, 2011 12:04 pm