The narrowest part of the adults upper airway is at the level of the?

• A. Vocal cords
• B. Cricoid cartilage
• C. Cricothyroid membrane
• D. Hyoid bone

Answer: (A)

The narrowest part of the adult upper airway is the glottic opening formed by the vocal cords. This opening sets the smallest diameter through which air must pass, so it acts as the bottleneck for airflow during breathing. Above the glottis the airway is relatively spacious, and below it the trachea widens again, making the vocal cords the defining point of airway resistance in adults. In contrast, in children the narrowest segment is the subglottic region around the cricoid cartilage, which is why pediatric airways behave differently. The cricothyroid membrane and the hyoid bone aren’t natural constrictions of the airway, and the cricothyroid membrane serves more as a landmark and access point for emergency procedures.