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Flashcards in Neuro 2 pt2 Deck (24)
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1
Q

Cranial Nerve III: Oculomotor

Functions (3)

A

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

2
Q
Define:
Mydriasis
Diplopia
Ptosis
The 3 of these at once can be found in what?
A

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

3
Q

CN3 moves the eyes which way?

A

medially (up and down)

4
Q

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

A

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

5
Q

__ separates the cererebellum from the brainstem

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

A

Tentorium

6
Q
  • up to 1mm difference in pupil size can be normal. this is called:
A

Anisocoria

7
Q

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 __

A

Marcus Gunn Pupil.

Seen in Optic Neuritis esp. MS

8
Q

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

A

DM or Neurosyphilus

9
Q

Know that Horner can be caused by __

A

carotid dissection

10
Q

Tear in intima

Ascending sympathetic supply w/I carotid sheath can cause

A

Horner Syndrome

11
Q

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.

A

Trochlear

12
Q
which cn# for which eye muscle?
Superior rectus muscle
Inferior oblique, Inferior
Trochlear nerve
Lateral rectus
A

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

13
Q
Cranial Nerve V: Trigeminal
Conveys sensory (V1,2) impulses from \_\_
supplies motor (V3) fibers for \_\_
A

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

14
Q

Tic douloureux =

A

trigeminal neuralgia

15
Q

This is the largest CN and it has 3 divisions.

A

Cranial Nerve V: Trigeminal

16
Q

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

A

Trigeminal Neuralgia

17
Q

Cranial Nerve VI Dysfunction:

A

cross-eyed

18
Q

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

A

medial position (cross-eyed)

19
Q

Being cross-eyed is damage to what nerve?

A

CN VI Abducens

20
Q
Facial nerve
motor functions (1)
sensory functions (1)
A

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

21
Q

Most common cause of Bell’s Palsy

A

Herpes simplex I virus

22
Q

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

A

Facial nerve (CNVII)

23
Q

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

A

Bell’s palsy

24
Q

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)

A

corticosteroids
antivirals

this is Bell’s palsy