Which palatal muscle is not involved in speech?

The tensor veli palatini is primarily involved in the function of the soft palate during swallowing and helps to open the eustachian tube, thereby equalizing ear pressure. However, it does not play a direct role in the coordination and modulation of speech sounds.

In contrast, the levator veli palatini is crucial for elevating the soft palate to close off the nasopharynx during speech, preventing the escape of air and sound into the nasal cavity. Similarly, the palatoglossus contributes to the movements necessary for articulation and is involved in creating the correct oropharyngeal shape for effective speech. The musculus uvulae aids in the proper functioning of the soft palate during phonation. Therefore, since the tensor veli palatini's primary role is related to actions other than speech, it is correctly identified as the muscle not involved in speech.