Video 1 - a: Nasopharynx function during belch. b: Nasopharynx function during swallow.

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Video demonstrating first nasopharynx function during belching then nasopharynx function during swallow. Nasopharynx function during belch: concurrent videoendoscopic and videofluoroscopic recording of nasopharynx during belching induced by interesophageal air injection (20 mL). During belching, there is no adduction of the proximal pharyngeal muscles, and nasopharyngeal closure (NPC) is primarily attributed to palatal elevation and velopharyngeal contact. Nasopharynx function during swallow: in contrast, NPC during swallowing includes the adduction of proximal pharyngeal muscles in addition to palatal elevation.