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Neuro Exam II > CN IV > Flashcards

CN IV Flashcards

1
Q

what are the 5 functional compoents of the facial nerve

A

SVE, SVA, GVE, GSA, Gva

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2
Q

sve AFFECTS

A

MUSCLES OF FACIAL EXPRESSION

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3
Q

sva AFFECTS

A

TASTe to anterior 2/3 of tongue

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4
Q

GVE affects

A

parasymph innervation to lacrimal, saliary, nasal, palatine glands

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5
Q

GSA affects

A

skin of back of ear, auricle, external auditory meauts

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6
Q

GVA affects

A

nasal cavity, soft palate, surrounding pharyngeal wall

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7
Q

what are the 2 roots of CN VII

A

facial nerve proper

nervus intermedius

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8
Q

what innervation does facial nerve proper provide

A

motor

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9
Q

what innervation does nervus intermedius provide

A

sensory and parasympathetic

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10
Q

what is the sensory ganglion of CN VII

A

geniculate ganglion

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11
Q

what are teh 2 parasympahteic ganglia of CN VII

A

pterygopalatine

submandibular

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12
Q

function of pterygopalatine ganglia

A

hay fever ganglion

innervate alcrimal and nasal glands

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13
Q

function of submandibular gland

A

innervates submandibula rand sublingual glands

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14
Q

what are the 2 nuclei of the facial n

A

facial nucleus

superior salivatory nuclues

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15
Q

what type o fnucleus is the facial nucleus

A

motor

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16
Q

what type of nucleus is the rsuperior salivatory nucleus

A

parasympatheric

17
Q

how is taste projected

A

via solitary tract to solitary nucleus

18
Q

upper half of facial nucleus receives what

A

bilateral corticonuclear projections

19
Q

lower half of the facial nucleus recieves what

A

only contralateral corticonuclear projections

20
Q

facial nerve forms _____ limb of corneal blink reflex arc

A

efferent (motor)

21
Q

how does CN VII exit the brainstem

A

through internal acoustic meatus with vestibulouscochlear n

22
Q

the geniculate ganglion contains what

A

cell bodies o fpseudounipolar neurons

23
Q

what are teh 3 branches of the facial n within the pertrous portion of temporal bone

A

greater petrosal
chorda tympani
nerve to stapedius

24
Q

greater petrosal n

A

carries axons of preganglionic parasymph neruons that are on their way to pterygopalatine galion

25
Q

chorda tympani

A

carry taste fibers and axons of preganglionic parasymphateic neurons

26
Q

hay fever

A

inhlation of pollen stimulates nerve terminals of nasal cavity
superior salivatory nucleus stimulates which stimulated fivers in pterygopalatine glanlion

27
Q

how do you get crocodile tear syndrome

A

lesion in facial canal that damages n fibers located in facial n proximal to geniculate ganglion

28
Q

what is the symptom of crocodile tear syndrome

A

when the pt starts eating they start crying

29
Q

what is happening in crocodile tear syndrome

A

instead of axons growing to join chorda tympani they join the greater petrosal n as well

30
Q

what gives you a imitation smile

A

pyramidal system

31
Q

what gives you a a geniune (duchenne) smile

A

accessory motor area to reticular formation to facial nuclus and muscles of facial expression

32
Q

if you damage affarent limb (V1) and brush cotton over affect cornea

A

neither eye will blink

33
Q

if you damage affarent limb (V1) and brush cotton over unaffected eye

A

both eyes blink

34
Q

if you damage efferent limb (facial) and stimulate affected eye

A

unaffected eye will blink

35
Q

if you damage efferent limb (facial) and stimulate unaffected eye

A

unaffected eye will blink

36
Q

bell’s palsy is an example of what type of lesion

A

LMN lesion

37
Q

what happens with CN VII LMN lesion

A

affected side paralyzed, unaffected normal

38
Q

what happens if you have corticonuclear fibers UMN lesion

A

weakenss, paralysis on contralatearl side of lower part of face

Neuro Exam II (10 decks)

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