scalenus medius muscle

sca·le·nus me·di·us mus·cle

(skā-lē'nŭs mē'dē-us mŭs'ĕl) Origin, costotransverse lamellae of transverse processes of second to sixth cervical vertebrae; insertion, first rib posterior to subclavian artery; action, raises first rib; nerve supply, cervical plexus.
Synonym(s): musculus scalenus medius.