Which muscle opens the Eustachian tube during yawning and swallowing?

Which muscle opens the Eustachian tube during yawning and swallowing?

• A. Tensor palatini
• B. Levator palatini
• C. Tensor tympani
• D. Levator veli palatini

Answer: (A)

The muscle that opens the Eustachian tube during yawning and swallowing is the tensor veli palatini. When it contracts, it pulls on the lateral wall of the cartilaginous portion of the Eustachian tube, actively opening the tube so air can move between the middle ear and the nasopharynx. This action helps equalize middle ear pressure, which is why yawning or swallowing often feels like it "clears" the ears. The other muscles listed have different roles: the tensor tympani tenses the tympanic membrane to dampen sounds; the levator veli palatini elevates the soft palate but does not open the Eustachian tube; the levator palatini (levator veli palatini) also helps lift the soft palate without opening the tube.

The muscle that opens the Eustachian tube during yawning and swallowing is the tensor veli palatini. When it contracts, it pulls on the lateral wall of the cartilaginous portion of the Eustachian tube, actively opening the tube so air can move between the middle ear and the nasopharynx. This action helps equalize middle ear pressure, which is why yawning or swallowing often feels like it "clears" the ears. The other muscles listed have different roles: the tensor tympani tenses the tympanic membrane to dampen sounds; the levator veli palatini elevates the soft palate but does not open the Eustachian tube; the levator palatini (levator veli palatini) also helps lift the soft palate without opening the tube.