Which nerve provides motor innervation to the soft palate and pharynx (excluding tensor veli palatini)?

• A. Accessory nerve (CN XI)
• B. Glossopharyngeal nerve (CN IX)
• C. Vagus nerve (CN X)
• D. Trigeminal nerve (CN V)

Answer: (C)

Motor control of the soft palate (apart from the tensor veli palatini) and the pharynx is carried by the vagus nerve through the pharyngeal plexus. This means the muscles that elevate and tense the palate (such as levator veli palatini) and the muscles that constrict the pharynx (the pharyngeal constrictors), along with palatal muscles like palatoglossus, palatopharyngeus, and musculus uvulae, receive their motor fibers from the vagus. The tensor veli palatini is the exception, as it is innervated by the mandibular division of the trigeminal nerve (V3). Glossopharyngeal nerve supplies only the stylopharyngeus, not the soft palate muscles, and the accessory nerve does not provide the primary motor supply to these structures. So the correct nerve is the vagus.