The sternothyroid is a muscle located in the neck, specifically part of the infrahyoid muscle group. It plays a crucial role in the movement of the larynx and helps in swallowing by depressing the thyroid cartilage. This muscle originates from the sternum and inserts into the thyroid cartilage. Functionally, the sternothyroid works alongside other muscles, such as the sternohyoid and thyrohyoid, to stabilize and control the position of the hyoid bone and larynx. Proper functioning of the sternothyroid is essential for effective speech and breathing, as it influences the tension and position of the vocal cords.