Video 3 - Pharyngoglottal closure reflex.

Injection of minute amounts of water into the pharynx results in brief closure of the vocal cords. In this video, the pharyngoglottal closure reflex in a healthy volunteer is stimulated by injection of minute amounts of colored water (for visualization purposes) into the pharynx. Contact of fluid with the posterior pharyngeal wall in the pyriform sinus induces a brief closure of the vocal cords. The event is shown in slow motion for ease of viewing.