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<br /> Scalenus anterior is one three deep muscles in the scalene group.<br /><br />ORIGIN<br /> Scalenus anterior originates from the anterior tubercles of the transverse processes of the third, fourth, fifth and sixth cervical vertebrae.<br /><br />INSERTION<br /> 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.<br /><br />INNERVATION<br /> Scalenus anterior is innervated by branches from the ventral rami of C4, C5 and C6 spinal nerves.<br /><br />BLOOD SUPPLY<br /> 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.
