Which muscle opens the auditory (pharyngotympanic) tube?

Which muscle opens the auditory (pharyngotympanic) tube?

• A. Levator veli palatini
• B. Palatoglossus
• C. Stylopharyngeus
• D. Tensor veli palatini

Answer: (D)

Opening the auditory (pharyngotympanic) tube to equalize middle-ear pressure is mainly done by the tensor veli palatini. When this muscle contracts, its tendon wraps around the pterygoid canal and pulls on the cartilaginous part of the tube, widening the tube and allowing air to pass between the nasopharynx and middle ear during swallowing or yawning. This action keeps middle-ear pressure balanced. The other muscles listed don’t directly open the tube: the levator veli palatini elevates the soft palate (helping seal the nasopharynx during swallowing but not opening the tube itself), while stylopharyngeus and palatoglossus act on the pharynx or tongue aspects and do not participate in opening the auditory tube.

Opening the auditory (pharyngotympanic) tube to equalize middle-ear pressure is mainly done by the tensor veli palatini. When this muscle contracts, its tendon wraps around the pterygoid canal and pulls on the cartilaginous part of the tube, widening the tube and allowing air to pass between the nasopharynx and middle ear during swallowing or yawning. This action keeps middle-ear pressure balanced.

The other muscles listed don’t directly open the tube: the levator veli palatini elevates the soft palate (helping seal the nasopharynx during swallowing but not opening the tube itself), while stylopharyngeus and palatoglossus act on the pharynx or tongue aspects and do not participate in opening the auditory tube.