sternothyroid muscle sternothyroid muscle the sternothyroid muscle, or sternothyroideus, is an infrahyoid muscle in the neck. it acts to depress the hyoid bone. it is below the sternohyoid muscle. it is shorter and wider than the sternohyoid. sternothyroid musclesternothyroid visible center leftsection of the neck at about the level of the sixth cervical vertebra. showing the arrangement of the fascia coli. (sternothyroideus labeled at right, third from top.)detailsoriginmanubriuminsertionthyroid cartilagearterysuperior thyroid arterynerveansa cervicalisactionsdepresses thyroid cartilageidentifierslatinmusculus sternothyroideusta98a04.2.04.006ta22173fma13343anatomical terms of muscle structure the sternothyroid arises from the posterior surface of the manubrium of the sternum, below the origin of the sternohyoid. it also arises from the edge of the cartilage of the first rib. it is inserted into the oblique line on the lamina of the thyroid cartilage. it is in close contact with its fellow at the lower part of the neck, but diverges somewhat as it ascends. it is occasionally traversed by a transverse or oblique tendinous inscription. innervation the sternothyroid muscle is innervated by the ansa cervicalis. variations doubling; absence; accessory slips to the thyrohyoid, inferior pharyngeal constrictor, or to the carotid sheath. function the sternothyroid muscle depresses the hyoid bone, along with the other infrahyoid muscle. clinical significance the upward extension of a thyroid swelling (goitre) is prevented by the attachment of the sternothyroid to the thyroid cartilage. a goitre can therefore only grow to the front, back or middle but no higher. additional images superficial dissection of the right side of the neck, showing the carotid and subclavian arteries. the fascia and middle thyroid veins. hypoglossal nerve, cervical plexus, and their branches. side view of the larynx, showing muscular attachments. sternothyroid muscle