Which statement about the cricoid ring is true?

• A. Extends 360 degrees around the trachea and is the top ring.
• B. Extends around the esophagus.
• C. Is the only complete ring around the trachea.
• D. Forms the inferior border of the larynx.

Answer: (C)

The main idea is that the cricoid ring is the only cartilaginous ring that fully encircles the trachea. The trachea’s rings are typically C-shaped and open posteriorly to allow the esophagus to distend when you swallow. In contrast, the cricoid cartilage forms a complete circle around the airway, which is what makes it distinctive.

This full circumferential ring sits just below the larynx and above the trachea, helping to define the lower boundary of the larynx and the upper portion of the trachea. It does not encircle the esophagus, and it is not the topmost ring of the trachea. The key takeaway is that its complete encirclement of the airway is the characteristic feature being tested.