Question
Nerve causing movement of the eyeball except?
| A. |
Optic Nerve |
| B. |
Oculomotor |
| C. | Trochlear |
| D. | Abducent |
|
Correct Answer � A Explanation |
 |
Ans. A. Optic Nerve
A mnemonic to remember the nerve supply to the extraocular muscles:
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LR6SO4O3
The letters represent the extraocular muscles and numbers represent their respective cranial nerve supply:
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LR6: lateral rectus, innervated by the 6th (abducens) nerve
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SO4: superior oblique, innervated by the 4th (trochlear) nerve
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O3: other muscles (superior, inferior, medial recti and inferior oblique), innervated by the 3 rd (oculomotor) nerve
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The nerves enter the ocular surface of the respective muscles.
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The trochlear nucleus of one side supplies the superior oblique of the contralateral side due to decussation of fibers of the trochlear nerve in the midbrain.
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