MCQ – 89406

Nerve causing movement of the eyeball except?

Correct Answer � A Explanation

Ans.  A. Optic Nerve

A mnemonic to remember the nerve supply to the extraocular muscles:

• LR6SO4O3 

The letters represent the extraocular muscles and numbers represent their respective cranial nerve supply:

• LR6: lateral rectus, innervated by the 6th (abducens) nerve 

• SO4: superior oblique, innervated by the 4th (trochlear) nerve

• O3: other muscles (superior, inferior, medial recti and inferior oblique), innervated by the 3 rd (oculomotor) nerve

• The nerves enter the ocular surface of the respective muscles. 

• 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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