A long slender muscle, which becomes tendinous about the middle of the neck and then divides into two thin, narrow, muscular branches. It passes along in front of the trachea or windpipe.

Origin. - Joined with its fellow on the opposite side, it arises from the cariniform cartilage in front of the sternum.

Insertion. - By one division into the posterior border of the thyroid cartilage of the larynx, by the other into the body of the hyoid or tongue bone.

Action. - To depress the hyoid bone and larynx.