Which cranial nerve is tested when asking a patient to stand with eyes closed to assess balance?

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Multiple Choice

Which cranial nerve is tested when asking a patient to stand with eyes closed to assess balance?

Explanation:
Balance relies on signals from the vestibular system in the inner ear, carried by the vestibulocochlear nerve. Asking someone to stand with eyes closed removes visual input, so the body must rely on vestibular information to maintain posture. This tests the vestibular portion of the cranial nerve, which is why the acoustic (vestibulocochlear) nerve is the best answer. The other nerves control unrelated functions—vagus affects autonomic and throat muscles, hypoglossal moves the tongue, and accessory runs the neck and shoulder muscles.

Balance relies on signals from the vestibular system in the inner ear, carried by the vestibulocochlear nerve. Asking someone to stand with eyes closed removes visual input, so the body must rely on vestibular information to maintain posture. This tests the vestibular portion of the cranial nerve, which is why the acoustic (vestibulocochlear) nerve is the best answer. The other nerves control unrelated functions—vagus affects autonomic and throat muscles, hypoglossal moves the tongue, and accessory runs the neck and shoulder muscles.

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