Question 111: Which of the following nerves transmits impulses originating from the vestibular apparatus?
- A. Cranial nerve XI
- B. Cranial nerve VIII (Correct Answer)
- C. Cranial nerve VII
- D. Cranial nerve II
Explanation: ***Cranial nerve VIII***
- The **vestibulocochlear nerve (CN VIII)** is responsible for transmitting both auditory (cochlear branch) and balance (vestibular branch) information to the brain [1], [2].
- The **vestibular apparatus** in the inner ear detects head movements and position, and its impulses are carried by the vestibular part of CN VIII [2].
*Cranial nerve XI*
- **Cranial nerve XI (Accessory nerve)** primarily controls the **sternocleidomastoid** and **trapezius muscles**, involved in head and shoulder movement.
- It has no role in transmitting sensory information from the vestibular apparatus or the inner ear.
*Cranial nerve VII*
- **Cranial nerve VII (Facial nerve)** innervates the **muscles of facial expression**, carries taste sensation from the anterior two-thirds of the tongue, and supplies several glands.
- It is not involved in transmitting impulses related to balance from the vestibular apparatus.
*Cranial nerve II*
- **Cranial nerve II (Optic nerve)** is responsible for **vision**, transmitting visual information from the retina to the brain.
- It has no function related to the vestibular system or balance.