Which laryngeal structure is described as having an anterior arch and a signet shape?

The laryngeal structure characterized by an anterior arch and a signet shape is indeed the cricoid cartilage. This cartilage forms a complete ring around the trachea, with a broader posterior plate and a narrow anterior arch that resembles a signet ring, hence the description. The cricoid cartilage serves several important functions in the airway by providing support and stability to the larynx. Its unique shape allows it to interact effectively with the thyroid cartilage and articulate with the arytenoid cartilages, which are critical for sound production and airway protection during swallowing. The anatomy of the cricoid cartilage is essential for understanding the laryngeal framework and its role in phonation and respiration.