In pediatric airway anatomy, what is the narrowest part of the airway?

• A. Cricoid ring
• B. Thyroid cartilage
• C. Arytenoid cartilage
• D. Post carinal junction

Answer: (A)

The cricoid ring is the narrowest part of the pediatric airway. It forms a complete, non‑expandable circle of cartilage just below the vocal cords, which constrains the airway diameter more than the structures above or below it. The thyroid cartilage sits higher up in the larynx and is larger, the arytenoid cartilages are smaller, and the post carinal junction is well below the larynx, so they are not the limiting segment. In kids, this subglottic region at the cricoid is the tightest point, whereas in adults the narrowest portion is at the glottis.