End
1 :

Hint : Lateral eye movement = abducens nerve πŸ‘οΈβž‘οΈ

Correct Answers:

  • Cranial nerve VI


Rationale :

Cranial nerve VI controls the lateral rectus muscle of the eye.

πŸ‘‰ The lateral rectus is responsible for abducting the eye (moving it outward/laterally).

πŸ‘‰ If CN VI is impaired, the patient cannot move the eye laterally.

πŸ‘‰ This results in horizontal diplopia (double vision), especially when looking outward.

πŸ‘‰ The eye may drift medially due to unopposed action of the medial rectus muscle.

πŸ‘‰ It is commonly affected in conditions like increased intracranial pressure or trauma.

πŸ‘‰ The β€œfollow my finger” test directly assesses extraocular movement function.

πŸ‘‰ Therefore, inability to move the eye laterally indicates CN VI dysfunction.

❌ Cranial nerve IV (Trochlear nerve)

πŸ‘‰ Controls the superior oblique muscle.

πŸ‘‰ Affects downward and inward eye movement, not lateral movement.

❌ Cranial nerve V (Trigeminal nerve)

πŸ‘‰ Responsible for facial sensation and chewing muscles.

πŸ‘‰ Does not control eye movement.

❌ Cranial nerve III (Oculomotor nerve)

πŸ‘‰ Controls most eye movements, pupil constriction, and eyelid elevation.

πŸ‘‰ Damage causes β€œdown and out” eye position and ptosis, not isolated loss of lateral movement.


Distractor Analysis :

Rationale for Incorrect Options to be Available Soon

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