Neuro 2 pt2

Question 1

Cranial Nerve III: Oculomotor

Functions (3)

Answer 1

raising the eyelid
moves eyeball up/down/in
constricting the iris

Question 2

Define:
Mydriasis
Diplopia
Ptosis
The 3 of these at once can be found in what?

Answer 2

pathologic dilation of the pupil
double vision
eyelid drooping
complete cranial nerve palsy.

Question 3

CN3 moves the eyes which way?

Answer 3

medially (up and down)

Question 4

why do the eyes move ‘down and out’ with cranial nerve 3 palsy?

Answer 4

Because trochlear nerve only contributes is downward motion of the eyeball. Inward motion is totally overtaken by the lateral rectus muscle.

Question 5

__ separates the cererebellum from the brainstem

a bleed or tumor may pus the brainstem a little, and CN3 is right by it

Answer 5

Tentorium

Question 6

• up to 1mm difference in pupil size can be normal. this is called:

Answer 6

Anisocoria

Question 7

Shine the light on a pupil and it dilates! b/c there is a pathway problem. What is this called?
And what is this often seen in? ___ especially __

Answer 7

Marcus Gunn Pupil.

Seen in Optic Neuritis esp. MS

Question 8

Nonreactive pupils that only constrict in near response is found in (2)

Answer 8

DM or Neurosyphilus

Question 9

Know that Horner can be caused by __

Answer 9

carotid dissection

Question 10

Tear in intima

Ascending sympathetic supply w/I carotid sheath can cause

Answer 10

Horner Syndrome

Question 11

Trouble looking down when walking down stairs is damage to what nerve? He has his head sideways, b/c loss of some function in one eye makes him turn his head to try and compensate.

Answer 11

Trochlear

Question 12

which cn# for which eye muscle?
Superior rectus muscle
Inferior oblique, Inferior
Trochlear nerve
Lateral rectus

Answer 12

Superior rectus muscle – CN3
Inferior oblique, Inferior, CN3
Trochlear nerve – CN4
Lateral rectus – CN6

Question 13

Cranial Nerve V: Trigeminal
Conveys sensory (V1,2) impulses from \_\_
supplies motor (V3) fibers for \_\_

Answer 13

sensory: various areas of the face
motor: mastication. all the chewing muscles

Question 14

Tic douloureux =

Answer 14

trigeminal neuralgia

Question 15

This is the largest CN and it has 3 divisions.

Answer 15

Cranial Nerve V: Trigeminal

Question 16

Brief, paroxysmal, intense stabbing or shocklike pain in one or more of the trigeminal branches
Caused by irritation of nerve, usually an aberrant vessel

Answer 16

Trigeminal Neuralgia

Question 17

Cranial Nerve VI Dysfunction:

Answer 17

cross-eyed

Question 18

If Abducens nerve doesn’t work, your eyeball will default to

Answer 18

medial position (cross-eyed)

Question 19

Being cross-eyed is damage to what nerve?

Answer 19

CN VI Abducens

Question 20

Facial nerve
motor functions (1)
sensory functions (1)

Answer 20

motor: facial expression
sensory: taste from anterior 2/3 of tongue

Question 21

Most common cause of Bell’s Palsy

Answer 21

Herpes simplex I virus

Question 22

herpes simplex I virus is the most common cause of Bell’s palsy, which affects which nerve?

Answer 22

Facial nerve (CNVII)

Question 23

sudden onset of facial muscle paralysis on affected side; proximal lesion can affect: (think about what the facial nerve does – expressions, taste)

Answer 23

Bell’s palsy

Question 24

sudden onset of facial muscle paralysis on affected side; proximal lesion can affect: (think about what the facial nerve does – expressions, taste)

How will you tx if you dx early enough? (2)

Answer 24

corticosteroids
antivirals

this is Bell’s palsy