Ptosis of the Eyelid and Fixed/dilated Pupil are Indicative Of

Question

Ptosis of the eyelid and fixed/dilated pupil are indicative of
A) damaged CN II.
B) damage: primary visual cortex.
C) inflammation of the facial nerve.
D) excess pressure on the oculomotor nerve.

Accepted Answer

Ptosis of the eyelid and fixed/dilated pupil are indicative of excess pressure on the oculomotor nerve, which controls the muscles that lift the eyelid and constrict the pupil. This can be caused by conditions such as aneurysms or tumors that compress the nerve. Damaged CN II (A) would result in vision loss or visual field defects, while damage to the primary visual cortex (B) would affect visual processing but not cause ptosis or pupil dilation. Inflammation of the facial nerve (C) would affect facial movement but not cause ptosis or pupil dilation.