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Scalenus Anterior


 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