BRAIN
CRANIAL NERVES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Oculomotor Nerve (III), Trochlear Nerve (IV), and Abducens Nerve (VI) are concerned with ____
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Vision
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Pain of the eye; blinking
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Regulation of voluntary movements of the eyelid, eyeball, and pupil constriction
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Swallowing
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Explanation:
Detailed explanation-1: -Cranial nerves III (CNIII) (oculomotor), IV (trochlear), and VI (abducens) control the position of the eyeballs; CNIII influences the position of the eyelids and the size of the pupils.
Detailed explanation-2: -Oculomotor nerve (III) is responsible for the control of the pupil (constriction) via parasympathetic fibres (this is opposed by dilator tone controlled by sympathetic pathways).
Detailed explanation-3: -The 3rd cranial nerve also controls eye muscle movement. Cranial Nerve IV (Trochlear) controls downward eye movement toward the nose, and Cranial Nerve VI (Abducens) controls horizontal eye movement toward the temple. The ability to move the eye in all other directions is controlled by CN III.
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