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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Abducens
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Oculomotor
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Trochlear
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Detailed explanation-1: -The oculomotor nerve is the third cranial nerve (CN III). It allows movement of the eye muscles, constriction of the pupil, focusing the eyes and the position of the upper eyelid.
Detailed explanation-2: -Pupillary light reflex is used to assess the brain stem function. Abnormal pupillary light reflex can be found in optic nerve injury, oculomotor nerve damage, brain stem lesions, such as tumors, and medications like barbiturates.
Detailed explanation-3: -The corneal reflex is a reliable measure of afferent trigeminal V1 and efferent facial nerve VII fibers (a V‐VII reflex) and is present at infancy. Lightly touching the cornea with a tissue or cotton swab induces a rapid bilateral blink reflex (Fig. 10‐4A).
Detailed explanation-4: -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.