Anterior Scalene:The anterior scalene muscle is one of the lateral muscles of the neck, deep to the prominent sternocleidomastoid muscle.
Origin: Anterior Scalene originates from the anterior tubercles of the transverse processes of C3-C6.
Insertion: Anterior Scalene inserts into the scalene tubercle on the inner border of the first rib, and into the ridge on the upper surface of the rib in front of the subclavian groove.
Function: Elevation of the first rib. Ipsilateral contraction causes ipsilateral lateral flexion of the neck, and bilateral contraction causes anterior flexion of the neck.
Nerve Supply: Anterior rami of C5-C6.
Blood Supply: Ascending cervical branch of the inferior thyroid artery.