scalenus anterior muscle

sca·len·us an·te·ri·or muscle

(skā-lē'nŭs an-tēr'ē-ŏr mŭs'ĕl) Lateral muscle of inferior half of neck; origin, anterior tubercles of transverse processes of third to sixth cervical vertebrae; insertion, scalene tubercle of first rib; action, raises first rib; nerve supply, cervical plexus.
Synonym(s): anterior scalene muscle, musculus scalenus anterior, musculus scalenus anticus.