The thyroarytenoid is a muscle located in the larynx, or voice box, which plays a crucial role in voice production. It runs from the thyroid cartilage to the arytenoid cartilage, helping to adjust the tension of the vocal cords. This muscle is essential for modulating pitch and volume during speech and singing. When the thyroarytenoid contracts, it shortens and thickens the vocal cords, resulting in a deeper sound. Conversely, when it relaxes, the vocal cords become longer and thinner, producing higher pitches. Understanding this muscle is important for fields like laryngology and vocal training.