Fixed dilated pupil following RTA (16/1700)

A 22yo man has a reduced conscious level and a fixed dilated pupil after being involved in a MVC. Choose the single most appropriate option?
a. Facial nerve
b. Oculomotor nerve
c. Olfactory nerve
d. Optic nerve
e. Trigeminal nerve























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answerB
The second cranial nerve is called the optic nerve.  It sends visual information from the eye to the brain.  The third cranial nerve is called the oculomotor nerve.  It is involved with eye movement, eyelid movement, and the function of the pupil and lens.  The fourth cranial nerve is called the trochlear nerve and the sixth cranial nerve is called the abducens nerve.  They each innervate an eye muscle involved in eye movement.  The fifth cranial nerve is called the trigeminal nerve.  It provides facial sensation (including corneal sensation).