Sternohyoid muscle
The sternohyoid muscle is a thin, narrow muscle attaching the hyoid bone to the sternum. It is one of the paired strap muscles of the infrahyoid muscles. It is supplied by the ansa cervicalis. It depresses the hyoid bone. Structure. The sternohyoid muscle is one of the paired strap muscles of the infrahyoid muscles. It arises from the posterior border of the medial end of the clavicle, the posterior sternoclavicular ligament, and the upper and posterior part of the manubrium of the sternum. Passing upward and medially, it is inserted by short tendinous fibers into the lower border  of the body of the hyoid bone. It runs lateral to the trachea. Nerve supply. The sternohyoid muscle is supplied by a branch of the ansa cervicalis. Variations. The sternohyoid muscle may be doubled, have accessory slips (Cleidohyoideus) or be completely absent in some people. It sometimes presents a transverse tendinous inscription immediately above its origin. Function. The sternohyoid muscle performs a number of functions: