Lecture 2 - Dipolpia Flashcards Preview

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Flashcards in Lecture 2 - Dipolpia Deck (20)
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1

what is the technique for examining extraocular muscles

instruct patient to...

- follow your finger with eyes, not head

- report if they see two objects at any time during the test

- finger 12-18" away from face

- move slowly in "H" pattern, noting any weakness or nystagmus

2

what are the cardinal fields of Gaze or "H pattern" of Gaze

3

what muscles of the eye are under CN III (oculomotor's) control

medial rectus, superior rectus, inferior rectus, inferior oblique, and levator palpebrae superioris

4

moves the eye medially (nasally) form the midline position

medial rectus

 

5

moves the eye superiorly from the extreme lateral position

superior rectus

6

moves the eye inferiorly from the extreme lateral position

inferior rectus

7

moves the eye superiorly from the extreme medial (nasal) position

inferior oblique

8

if upper lids do not elevate, result

levator palpebrae superioris lesion

9

if the globes do not elevate, result

lesion with inferior oblique and superior rectus 

10

what eye muscle is under control of by CN IV (trochlear)

superior oblique muscle

11

moves the eye inferior from the extreme medial (nasal) position

superior oblique muscle

12

what is the position of the patients head to resolve their diplopia from a R weak superior oblique? 

where is the eye on the weak side directed?

L head tilt (R sits higher) 

superior medial 

13

do patients have double vision with CN III lesions?

no, only ptosis

14

when a patients eye moves by itself, this is called

dissociated nystagmus

15

when a patients eye's jump together, this is called

nystagmus

16

- when acetylcholine receptors are attacked with antibodies (usually gets worse with age)

- diplopia and ptosis is this until proven otherwise 

- failure of elevation of globe and upper lid, confrims Dx of this

- evaluate neck extensors and look at repetitive bulbar muscle function

- pupillary light reflexes are normal

this is called

myesthenia gravis

17

aneurysm, junction of internal carotid artery and anterior cerebral artery

CN III condition

18

aneurysm of posterior communicating artery at junction of posterior cerebral artery

CN III condition

19

1. CN III

2. chiasm 

3. cavernous sinus

4. CN VI

20

1. internal carotid artery

2. CN IV

3. V1

4. V2