The left pupil of a patient fails to accommodate. This finding may reflect an abnormality in which cranial nerve?
a. CN III
b. CN V
c. CN VIII
d. CN X
A
CN III, the oculomotor nerve, is responsible for accommodation. Failure of a pupil to accommodate reflects an abnormality in this cranial nerve. CN V, the trigeminal nerve, controls the corneal reflex, chewing, and biting. CN VIII, the acoustic nerve, plays a role in hearing and the sense of balance. CN X, the vagus nerve, affects heart rate, peristalsis, swallowing, and the gag reflex.
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