cranial nerve examination Flashcards Preview

MD4001 > cranial nerve examination > Flashcards

Flashcards in cranial nerve examination Deck (55)
Loading flashcards...
1

what cranial nerve is affected in Bell's palsy

7

2

why might the head be tilted in a cn 4 lesion

paralysis of superior oblique which brings eye inwards and down
this causes the patient to compensate by lifting the eye away from the side of the lesion

3

what is the main nerve that supplies taste

7

4

what nerve identifies irritant odors

5 (not 1)

5

what nerve is tested for when you ask the patient about walking downstairs

occulomotor/ trochlear

6

what does a skewed position of the eyes suggest

lesion of the medial longitudinal fasciculus ( carries information about the direction that the eyes should move)

7

what type of ptosis is found in horner's

partial always

8

what type of ptosis is found in third nerve palsy

may be partial but is usually complete

9

what are some other causes of ptosis

congenital, myasthenia gravis

10

what is the innervation of levator palpebrae superioris

occulomotor and also sympathetic

11

what does miosis mean

small pupil

12

what is enopthalmos

partial backwards displacement of the eyeball

13

how do you use a snellen chart

ask patient to read the lowest line down possible
from 6m away
can wear corrective glasses

14

what should you do if they cant read the top line

can the count fingers/ recognise hand movements or see light

15

what are limbs of the light reflex (pupil constricts in response to light)

optic nerve afferent
psymp of occulomotor is efferent

16

what is the parasympathetic supply to the pupil controlled by

edinger westphal nucleus

17

what does the consensual response mean

the pupil on the opposite side to that which light is being shone in constricts

18

what are Argyll Robertson pupils

accommodate but do not react to light
caused by neurosyphilis

19

how far away from the patient should you place your finger when testing accommodation reflex

50 cm

20

what mediates the accommodation reflex

afferent- optic (
efferent- oculomotor (psymp from edinger westphal)

21

what parts of the brain ensure that both eyes move together

frontal and occipital lobes
cerebellum and vestibular nuclei
integrated in the brainstem
medial longitudinal fasciculus

22

where is the medial longitudinal fasciculus found

runs between nuclei of 3 and 4 in the midbrain and 6 in the pons

23

what supplies superior oblique

4

24

what supplies lateral rectus

6

25

what muscles elevates the eye

superior rectus and inferior oblique

26

what muscles depress the eye

inferior rectus and superior oblique

27

what is the function of superior oblique

depresses, abducts and intorts the pupil (crosses eyes)

28

what is the function of inferior oblique

elevates, abducts and extorts the pupil

29

where can lesions be found

supranuclear
internuclear (mlf)
nuclear
nerve
nmj
muscle

30

what part of the brain controls eye pursuit

occipital lobe
patient tracks a moving target