sternohyoid

noun

ster·​no·​hy·​oid ˌstər-nō-ˈhī-ˌȯid 

: an infrahyoid muscle on each side of the midline that arises from the medial end of the clavicle and the first segment of the sternum, inserts into the body of the hyoid bone, and acts to depress the hyoid bone and the larynx

sternohyoid adjective