Tensor Veli Palatini Eustachian Tube — NDEB AFK MCQ
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Correct answer: A — Tensor veli palatini
The tensor veli palatini (innervated by V3) opens the Eustachian (pharyngotympanic/auditory) tube during swallowing, yawning, and chewing, equalising middle ear pressure with atmospheric pressure. This is clinically relevant during nitrous oxide sedation — N₂O diffuses into the middle ear faster than nitrogen diffuses out, increasing middle ear pressure. This can cause otalgia (ear pain) during or after sedation, particularly if the Eustachian tube is compromised (URI, otitis media). N₂O is contraindicated after recent middle ear surgery.
Reference: Moore – Clinically Oriented Anatomy, 9th ed., 2019