Which cranial nerve is primarily responsible for velopharyngeal closure during swallowing?

• A. Glossopharyngeal nerve (IX)
• B. Vagus nerve (X)
• C. Hypoglossal nerve (XII)
• D. Facial nerve (VII)

Answer: (B)

Velopharyngeal closure during swallowing is about lifting the soft palate to seal off the nasal cavity so food can pass into the oropharynx. The key muscle doing that lift is the levator veli palatini, and its motor supply comes through the pharyngeal plexus carried by the vagus nerve. So the vagus nerve is the primary driver of this closure. Other muscles, like the tensor veli palatini, help prepare the palate and are innervated by different nerves, but the main elevation needed for sealing the velopharyngeal port comes from the vagus.