Which cranial nerve is responsible for balance and hearing acuity?

• A. Vestibulocochlear
• B. Glossopharyngeal
• C. Vagus
• D. Hypoglossal

Answer: (A)

Balance and hearing rely on the vestibulocochlear nerve, which is the eighth cranial nerve. It has two divisions: the vestibular portion carries information about head position and movement for balance, while the cochlear portion transmits auditory information from the inner ear for hearing. Together, they enable you to sense where you are in space and to perceive sound. Damage to this nerve can lead to vertigo, nystagmus, tinnitus, and hearing loss. The other nerves listed have different roles—glossopharyngeal handles taste and swallowing, vagus supports autonomic and various motor functions, and hypoglossal controls tongue movements—so they aren’t responsible for balance and hearing.