Cervical Spine Rib Shoulder Elevation Muscles Scalenes Anterior Middle Posterior osteopath art. Shows anterior and lateral views during anterior, lateral and posterior scalene contraction and relaxation. DESCRIPTION Scalenus anterior is one three deep muscles in the scalene group.
ORIGIN Scalenus anterior originates from the anterior tubercles of the transverse processes of the third, fourth, fifth and sixth cervical vertebrae.
INSERTION Scalenus anterior inserts onto the scalene tubercle on the inner border of the first rib, and to a ridge on the upper surface of the rib, anterior to the groove for the subclavian artery.
INNERVATION Scalenus anterior is innervated by branches from the ventral rami of C4, C5 and C6 spinal nerves.
BLOOD SUPPLY Scalenus anterior is supplied by the inferior thyroid artery, a branch of the thyrocervical trunk. Cervical Spine Rib Shoulder Elevation Muscles Scalenes Anterior Middle Posterior osteopath art.
