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Neuro Exam II > CN I > Flashcards

CN I Flashcards

1
Q

GSA

A

general somatic afferent

touch, pain, pressurem temp, portion sense picked up by somatic structures

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2
Q

GVA

A

general visceral afferent

carry pain/pressure from visceral structures

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3
Q

GVE

A

autonomics

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4
Q

GSE

A

skeletal motor

originate from somites, innervate skeletal muscle

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5
Q

SVA

A

special visceral afferent

olfaction and taste

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6
Q

SSA

A

special somatic afferent

vision, hearing, balance

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7
Q

SVE

A

special visceral efferent

skeletal motor fibers that innervate skeletal muscles derived from pharyngeal arches

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8
Q

what fibers does CN I carry

A

SVA

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9
Q

what does the olfactory pathway consist of

A

sequence of olfactor receptor cells and second order neurons

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10
Q

where does the olfactory system project to

A

directly to olfactory cortex and limbic cortex, compeltely skips the thalamus

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11
Q

what is CN I formed by

A

all axons of 1st order neurons that pass through the cribiriform plate of ethmoid bone bilaterally

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12
Q

anosmia

A

complete loss of olfaction

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13
Q

hyposmia

A

partial loss of olfaction

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14
Q

parosmia

A

distorted perception of sense of smell

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15
Q

phantosmia

A

smelling thigns that aren’t there

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16
Q

what are the receptors of the visual system

A

rods and cones

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17
Q

what are the first order neurons of the visual pathway system

A

bipolar neurons

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18
Q

what are the second order neurons of the visual pathway

A

ganglion cells

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19
Q

what is the area lamina

A

located on posterior eyeball, ganglion cells gather and pass through to form the optic neurve

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20
Q

what is the optic nerve myelinated by

A

olgidendrocytes

21
Q

lateral geniculate nucleus

A

contains cell bodies of 3rd order neurons which give rise to geniculocalcarine tract

22
Q

superior colliculus

A

visual reflex center

23
Q

what happens if you completely transcet an eyeball

A

total blindness in that eye

24
Q

what happens if you have lesion of optic chaism horizontally affecting just one half

A

ipsilateral nasal hemianoopia

25
Q

what happens if you ahve a bilateral lesion of optic chiasm

A

binasal heteronymous hemianopia

26
Q

what can cause bilateral lesion of optic chiasm

A

internal carotid aneurysm

27
Q

what happens if you have lesion at center of optic chiasm

A

bitemporal heteronymous hemianopia

28
Q

what happens if you have lesion damaging ganglion cell axons of left optic tract

A

right homonymous hemianopia

29
Q

what happens if you have lesion of myer’s loop

A

right upper homonymous quadrantanopia (pie in sky)

30
Q

what happens if you have lesion of superior division of geniculocalcarine tract

A

right lower homonymous quadrantanopia (pie on floor)

31
Q

in general what results from lesion beofre/at optic chiasm

A

heteronymous

32
Q

in general what happens from lesion after optic chiasm

A

homonomous

33
Q

what can occlusion of PCA cause

A

macular sparing

34
Q

where is nucleus ambigous located

A

medulla

35
Q

what can lesion of CN XI high in the neck cause

A

SCM turns head upward to contralateral side as well as approximates ear to ipsilateral shoulder

36
Q

what can lesion of CN XI lower cause

A

mild shoulder droop and winged scap

37
Q

where is hypoglossal nucleus located

A

medulla

38
Q

what does CN XII innervate

A 
all intrinsic muscles that change shape of tongue
most extrincic (except geniohyoid)
39
Q

what happens with LMN lesion of XII

A

tongue deviates to side of lesion

40
Q

where are cell bodies on primary neurons in CN I

A

epithelium

41
Q

primary neurons in CN I can ____

A

regenerate

42
Q

what does CN I terminate in

A

olfactory bulb

43
Q

what do seoncdary nerurons of olfactory nerve form

A

olfactory tract

44
Q

what does olfactory tract divid into

A

medial and lateral olfactory stria

45
Q

lateral olfactory stria

A

principle central projection of olfacotry system

46
Q

what does lateral olfactory stria terminate in

A

olfactory cortex and amygdala

47
Q

what does the nucleus ambiguus give rise to

A

aberrant vagal fibers

48
Q

what spinal cord levels give rise to axons that form spinal accessory nerve

A

C1-C5(6)

Neuro Exam II (10 decks)

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