BRAIN
CRANIAL NERVES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Optic
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Trochlear
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Occulomotor
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Abducens
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Detailed explanation-1: -The oculomotor nerve (the third cranial nerve; CN III) has three main motor functions: Innervation to the pupil and lens (autonomic, parasympathetic) Innervation to the upper eyelid (somatic) Innervation of the eye muscles that allow for visual tracking and gaze fixation (somatic)
Detailed explanation-2: -The extraocular muscles are innervated by lower motor neurons that form three cranial nerves: the abducens, the trochlear, and the oculomotor (Figure 20.3).
Detailed explanation-3: -The oculomotor nerve has two distinct functions, the somatic motor that supplies four of the six extraocular muscles of the eye and the levator palpabrae superioris muscle of the upper eyelid. The visceral motor function provides parasympathetic innervations to the constrictor pupillae and ciliary muscles.