Which cartilage is NOT part of the larynx?

The epiglottis is considered the correct answer because it is not classified as a part of the laryngeal cartilages in the same manner as the other options listed. While the epiglottis is involved in the function of the larynx—particularly in the protection of the airway during swallowing—it is a separate structure that primarily serves a protective role rather than contributing to the framework of the larynx.

The thyroid, cricoid, and arytenoid cartilages are integral components of the larynx. The thyroid cartilage plays a significant role in forming the bulk of the laryngeal structure, providing attachment for vocal cords, while the cricoid cartilage forms a complete ring around the airway and supports the structure of the trachea. The arytenoid cartilages facilitate the movement and tension of the vocal folds, allowing for phonation. Thus, the distinction in structural function and classification makes the epiglottis the correct choice as not being part of the larynx's cartilage system.