The cricoid cartilage is the firm ring that forms the inferior part of the larynx.

The cricoid cartilage is the firm ring that forms the inferior part of the larynx.

• A. Cricoid
• B. Thyroid
• C. Pyriform
• D. Laryngeal

Answer: (A)

The key idea is identifying which cartilage forms the lower boundary of the larynx. The cricoid cartilage is a firm, complete ring that surrounds the airway, sitting just below the thyroid cartilage and atop the trachea. Its ring shape—a thick posterior part (the lamina) and a thinner anterior arch—makes it the structural base of the larynx and the inferior boundary to the airway. The thyroid cartilage forms the front shield of the larynx, not the ring; the pyriform region is a recess in the pharynx, not cartilage; and “laryngeal” in isolation isn’t a specific cartilage.

The key idea is identifying which cartilage forms the lower boundary of the larynx. The cricoid cartilage is a firm, complete ring that surrounds the airway, sitting just below the thyroid cartilage and atop the trachea. Its ring shape—a thick posterior part (the lamina) and a thinner anterior arch—makes it the structural base of the larynx and the inferior boundary to the airway. The thyroid cartilage forms the front shield of the larynx, not the ring; the pyriform region is a recess in the pharynx, not cartilage; and “laryngeal” in isolation isn’t a specific cartilage.