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.
References in periodicals archive ?
The scalenus anterior muscle pulls the lateral portion of the first rib proximally and posteriorly and the scalenus medius muscle pulls the medial portion of the first rib proximally and medially.
Murakami et al (2003) even report a case of total absence of the right scalenus anterior muscle, a rare occurrence also observed by Le Double (1897).