LEC53: Pathology of Cranial Nerves Flashcards Preview

Structures: Part Deux > LEC53: Pathology of Cranial Nerves > Flashcards

Flashcards in LEC53: Pathology of Cranial Nerves Deck (32):
1

disorders in what part of brain might CNI: olfactory n be involved with?

frontal lobe, because located just under frontal lobe

2

what is most common cause of loss of smell 

common cold, not CNI lesion

3

how to test if pt has CNI: olfactory n issue?

make sure pt has clear nasal paths by putting odor under nose - ensure it's not noxious

 

4

what & where is this, & what does it cause?

Q image thumb

meningioma on CNI: olfactory n

pt has loss of smell on 1 side

5

optic disc

where optic nerve enters globe

6

what does using opthalmoscope allow?

look into eye 

look for signs of either: 

1) opticatrophy

2) papilodema - swelling of the disc 

7

what is papilodema, what does it suggest?

swellings of the optic disc

sign of increased intercranial pressure

8

how to test visual field?

testing CNII: optic n

move fingers to different areas in pt's visual field; assess what they can see 

what they can or cannot see tells where meningioma is

9

which cranial nerves are occulomotor nerves?

CNIII, IV, VI

all move the eye

10

what does CNIII innervate re: eye

all extraoccular muscles EXCEPT lateral rectus, superior oblique

11

what does CNIII do re: pupil?

CNIII involves fibers that constrict pupil 

if knock out CNIII, pupil dialates

12

what happens if CNIII knocked out? 

1) pupil dialates

2) eye deviates LATERALLY b/c CNIII doesn't innervate lateral rectus m

3) eye deviates DOWNWARD b/c CNIII doesn't innervate superior oblique m

 

 

 

13

which structure is CNIII?

CNIII=oculomotor n, #3

 

A image thumb
14

what might pressure on CNIII indicate?

brain herniation

b/c CNIII located adjacent to TEMPORAL LOBE

if anything pushes temporal lobe, will compress CNIII

15

what is this condition? nerve damaged? 

Q image thumb

trochlear nerve palsy - head tilted slightly 

occurs b/c CNIV is a rotator; if knocked out, get slight head tilt

16

what is this condition?

 

Q image thumb

abducens palsy - knock out of CNVI 

pt gets double vision & knock out of lateral rectus m so eye cannot ABduct

can be unilateral or bilateral

 

17

what is this condition

Q image thumb

anducens (CN VI) palsy

18

what optic reflex is associated with CNV, trigeminal n? 

corneal reflex

NOT SCLERAL REFLEX

19

what is sensory field of CNV? 

A image thumb
20

cause and presentation of trigeminal neuralgia?

like "seizure" of CN V

sudden, severe pain in 1 of divisions of CN V

agonizing pain caused by chewing or slightest stimulation to effected area 

21

what does lesion of CN VII cause?

facial nerve palsy 

lesion involves ALL muscles of effected side of face 

 

22

what condition is this, what nerve is effected, what is presentation?

Q image thumb

facial nerve (CN VII) palsy

1) L eye open wider b/c weakness of eye closure muscles 

2) nasal labia fold more prominent on R side

3) if ask pt to show teeth, marked weakness contracting L facial muscles > see magnified asymmetry of eye fissures

23

what is this condition

 

Q image thumb

central (woman) and peripheral (man) bell's palsy 

CN VII facial n is effected 

usually 1 side of CN VII effected

24

what is an acoustic neuroma, which CN does it effect?

tumor on CNVIII, vestibulo-cochlear n

25

what is nystagmus, which CN involved?

sudden small movements of eyes 

CNVIII

26

how to test auditory capability? which nerve tested?

CNVIII, vestibulocochlear n

make dinging sound near ear

27

which nerves involved with gag reflex?

CN IX, CN X 

28

where does this pt have a lesion?

Q image thumb

R side of CN IX glossopharyngeal, CN X vagus

uvula deviates to STRONGER side

here deviation is to L side so lesion is R side

29

which muscles does CNXI, accessory, innervate?

1) trapezius 

2) sternocleidomastoid

30

drop shoulder is sign of what?

lesion to CNIX, spinal accessory n b/c innervates trapezius

31

what is this, what does it indicate?

Q image thumb

scalloping on side of tongue due to atrophy of tongue muscle, innervated by CN XII, hypoglassal n

32

what is effected here? 

Q image thumb

R side of tongue effected b/c strong side - L - pushes tongue out toward weaker muscle

innervation = CN XII, hypoglossal