origin: anterior tubercles of the transverse process of the 2nd to 6th cervical vertebrae;
insertion: scalene tubercles on anterior superior surface of the 1st rib;
- acting unilaterally, flexes and rotates cervicals and raises first rib;
- when acting bilaterally, flexes the neck;
nerve supply: anterior branches, C5, C6, C7, C8;
synergists: sternocleidmastoid, scalenus medius and scalenus posterior longus capitis, longus coli, suprahyoid, infrahyoid and the platysma
Original Text by Clifford R. Wheeless, III, MD.
Last updated by Data Trace Staff on Thursday, December 15, 2011 11:20 am