Which cranial nerve is responsible for balance and hearing?

• A. Vestibulocochlear
• B. Oculomotor
• C. Trigeminal
• D. Hypoglossal

Answer: (A)

Balance and hearing rely on the vestibulocochlear nerve, the eighth cranial nerve. It carries sensory information from the inner ear—the cochlea for hearing and the vestibular apparatus (semi-circular canals and related structures) for balance and spatial orientation. This nerve is purely sensory for these functions, which is why it is the one responsible for both hearing and balance. The other nerves listed have different primary roles: the oculomotor nerve moves the eye and controls pupil size; the trigeminal nerve provides facial sensation and motor control for chewing; the hypoglossal nerve moves the tongue. Understanding this helps when evaluating hearing or balance issues in patients, such as after anesthesia or neck/head trauma.