CN III: oculomotor nerve

Question 1

what is the function of the oculomotor nerve?

Answer 1

lifts the eyelid
adducts, lifts and depresses the pupil
extorsion, elevation and abduction (inferior oblique)

Question 2

what muscles does the oculomotor nerve innervate?

Answer 2

levator palpebrae superior (lifts eyelid)
superior rectus
inferior rectus
inferior oblique muscles

Question 3

what other parasympathetic structures does the oculomotor nerve innervate?

Answer 3

sphincter pupillae
ciliary muscles

Question 4

how is CN III examined, and what are you looking for in the examination?

Answer 4

H shape pattern
look for diplopia and blurred vision

Question 5

what symptoms occur in an oculomotor nerve palsy?

Answer 5

diplopia
ptosis
down and outwards pupil movement
inability to elevate, depress or adduct the pupil
dilated pupil

Question 6

What is the cause of an oculomotor nerve palsy?

Answer 6

raised intracranial pressure
artery aneursym
cavernous sinus infection
trauma