Sternohyoid: The sternohyoid muscle is located within the superficial plane.
Origin: Posterior surface of manubrium and an adjoining part of the clavicle, and posterior sternoclavicular ligament.
Insertion: lower border of the hyoid bone, medial to the omohyoid m. insertion.
Actions: Depresses the hyoid bone.
Innervation: Anterior rami of C1-C3, carried by a branch of the ansa cervicalis.