ster·no·hy·oid (mus·cle)

infrahyoid (strap) muscle of anterior neck; origin, posterior surface of manubrium sterni and first costal cartilage; insertion, body of hyoid bone; action, depresses hyoid bone; nerve supply, upper cervical via spinal nerves (ansa cervicalis).
Synonym(s): musculus sternohyoideus [TA]
References in periodicals archive ?
The Mandible directly involved in feeding and cleithrum supports the sternohyoideus muscle that is involved in mouth movement (Wagemans et al., 1998), therefore development of mandible and cleithrum supported feeding during early larval stages.
The canine thyroid is a dark red, elongated structure that is attached to the fascia along the ventrolateral surfaces of the proximal trachea, ventrally covered by the sternocephalicus and sternohyoideus muscles, and laterally covered by the sternothyroideus muscle.
The paired sternocephalicus and sternohyoideus muscles were separated and trachea was exposed.
The genus is diagnosed in having an interrupted post-labial fold, broad isthmus, gill openings not extending ventrally onto undersurface of head, 14-16 branched pectoral-fin rays, lower lip not connected to the base of the maxillary barbel by a skin flap, sulcus between the lip and the barbel, homodont dentition, teeth pointed, coni-form in both jaws, premaxillary tooth patches contacting each other but not confluent, not extended posterolaterally, laterally blunt; dilator operculi muscle and levator opercula muscle contacting each other, broad anterior end of sternohyoideus muscle, its width almost equal to the width in the axilla of the pectoral fin, adductor pelvicalis superficialis muscle not contacting its antimere at the midline (Zhou et al.
These traits include the following: (1) a laterally mobile suspensorium (cheek bones) which, when adducted, compresses the buccal cavity; (2) well-developed ventral body musculature, the obliquus inferioris, that attaches into the posterior margin of the pectoral girdle, thus stabilizing the latter as part of the mechanism of ventral buccal expansion; and (3) the primitive teleost mechanism of ventral buccal expansion via contraction of the sternohyoideus muscle.
In generalized teleosts, the pectoral girdle has limited motion and acts as a stable attachment site for the sternohyoideus muscle that inserts on and functions to depress the hyoid (Lauder 1983, 1985).