Cranial Nerve Palsies in the Eye Flashcards
1
Q
how can CN be affected?
A
compressed
herniation
2
Q
what does compression of CNIII cause?
A
paralysis of 4 extraocular muscles (IO, MR, SR, IR), levator pupillae superioris and parasympathetic innervation of sphincter of pupil
3
Q
presentation of CNIII palsy
A
- loss/slowed pupillary light reflex
- dilated pupil
- ptosis (drooping eyelid)
- down and out
4
Q
example of cause of CNIII palsy
A
raised ICP compresses CNIII if medial lobe herniates through tentorial notch
5
Q
what does compression of CNIV cause?
A
paralysis of SO
6
Q
presentation of CNIV paralysis
A
IO functions unopposed so left eye moves superomedial when gazing right
7
Q
how can CNVI be damaged?
A
stretching as it runs through the dura
8
Q
what does CNVI palsy cause?
A
paralysis of LR
9
Q
presentation fo CNVI palsy
A
eye is unable to move lateral in horizontal plane so there is medial deviation of the eye
