what extraocular muscles are innervated by CN III?
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CN III (Oculomotor nerve) innervates four of the six extraocular muscles that control eye movements. The extraocular muscles innervated by CN III are:
1. Levator palpebrae superioris muscle- This muscle elevates and retracts (lifts up) the upper eyelid.
2. Superior rectus muscle- It is responsible for upward eye movement and medial eye movement.
3. Inferior rectus muscle- It is responsible for downward eye movement and medial eye movement.
4. Medial rectus muscle- It is responsible for inward (medial) eye movement.
The other two extraocular muscles, the lateral rectus muscle and superior oblique muscle, are innervated by the abducens nerve (CN VI) and trochlear nerve (CN IV), respectively.
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