NEUROLOGY
OCULAR PALSIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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VI cranial pair
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IV cranial nerve
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V cranial pair
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lll Par craneal
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Detailed explanation-1: -The trochlear nerve (IV) exits from the caudal portion of the midbrain and supplies the superior oblique muscle. In distinction to all other cranial nerves, the trochlear nerve exits from the dorsal surface of the brainstem and crosses the midline to innervate the superior oblique muscle on the contralateral side.
Detailed explanation-2: -The trochlear nerve (CN IV) arises from the trochlear nucleus located within the periaqueductal gray substance of the midbrain and emerges on the dorsal midbrain caudal to the inferior colliculus. It then crosses the midline, before passing anteriorly around the contralateral side of the brainstem.
Detailed explanation-3: -The trochlear nerve, also known as cranial nerve 4 (CN IV), controls the superior oblique muscle in your eye. This muscle allows you to move your eyeball down and shift your gaze from side to side.