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Part 1 Boards Spinal > Cranial Nerves (21%) > Flashcards

Cranial Nerves (21%) Flashcards

1
Q

CN I

A

olfactory

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2
Q

CN II

A

optic

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3
Q

CN III

A

oculomotor

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4
Q

CN IV

A

trochlear

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5
Q

CN V

A

trigeminal

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6
Q

CN V1

A

ophthalmic

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7
Q

CN V2

A

maxillary

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8
Q

CN V3

A

mandibular

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9
Q

CN VI

A

abducens

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10
Q

CN VII

A

facial

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11
Q

CN VIII

A

vestibular cochlear

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12
Q

CN IX

A

glossopharyngeal

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13
Q

CN X

A

vagus “wanderer”

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14
Q

CN XI

A

accessory

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15
Q

CN XII

A

hypoglossal

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16
Q

CN I olfactory foramen exit

A

cribriform plate

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17
Q

CN II optic foramen of exit

A

optic canal

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18
Q

CN III oculomotor foramen of exit

A

superior orbital fissure SOF

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19
Q

CN IV trochlear foramen of exit

A

superior orbital fissure SOF

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20
Q

CN V1 ophthalmic foramen of exit

A

superior orbital fissure SOF

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21
Q

CN V2 maxillary foramen of exit

A

foramen rotundum

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22
Q

CN V3 mandibular foramen of exit

A

foramen ovale

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23
Q

CN VI

A

superior orbital fissure SOF

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24
Q

CN VII facial mandibular foramen of exit

A

internal auditory meatus exits through styloid mastoid

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25
Q

CN VIII vestibular cochlear foramen of exit

A

internal auditory meatus

26
Q

CN IX glossopharyngeal foramen of exit

A

jugular foramen (temporal and occipital = jugular)

27
Q

CN X vagus foramen of exit

A

jugular foramen

28
Q

CN XI accessory foramen of exit

A

jugular foramen

29
Q

CN XII hypoglossal foramen of exit

A

hypoglossal canal

30
Q

CN I function; nuclei and ganglia

A

sensory-smell; does not synapse in thalamus (olfactory neurons to mitral cells in olfactory bulb to olfactory tract to meidal and lateral stria fibers to the primary olfactory cortex (periamygdaloid area, prepiriform area and uncus BA 34) or to secondary olfactory cortex/BA28

31
Q

loss of smell

A

anosmia

32
Q

CSF leakage may indicate

A

skull fracture (cribriform plate damaged)

33
Q

CN II optic function; nuclei and ganglia

A

sensory- vision; photoreceptors (rods and cones) to bipolar cells to ganglion cells to optic disc to optic n. (enter skull through optic canal) unite to form optic chiasma where medial fibers of each retina cross while lateral retinal fibers will not cross; these fibers split to form optic tracts which travel around cerebral peduncles and synapse on one of three nuclei

34
Q

CN II optic nuclei (optic tracts synapse on one of three nuclei)

A
  1. lateral geniculate body relay to occipital lobe of cortex BA 17
  2. superior colliculus relayed to tectospinal tract (trap and SCM)
  3. pretectal nucleus of midbrain (light reflex)
35
Q

lesion of optic nerve will result in loss of

A

vision of one eyeball

36
Q

lesion of optic chiasma will result in

A

tunnel vision

37
Q

lesion of optic tract will result in

A

loss of half of visual field

38
Q

CN III oculomotor function

A

motor only: all extraocular eye muscles except superior oblique and lateral rectus

39
Q

Superior ramus of CN III supplies (2 eye m.) Inferior ramus of CN III supplies (3 eye m.)

A

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

40
Q

accessory oculomotor nucleus of CNIII is aka

A

edinger westfall nucleus

41
Q

edinger westfall/accessory oculomotor nucleus supplies

A

ciliaris and pupillary constrictor

42
Q

CN IV (trochlear n.) function (SO4)

A

somatic motor supplying superior oblique m.

43
Q

CN IV (trochlear n) nuclei and ganglia

A

BA 8 of cortex, superior colliculus and inferior longitudinal cplliculus sends axons to TROCHLEAR nucleus

44
Q

after exiting the CNS CN IV continues within cavernous sinus, enters orbit through superior orbital fissure and supplies ___

A

superior oblique muscle

45
Q

CN IV has communication with what plexus

A

cavernous plexus

46
Q

CN IV is on the sup-med aspect of orbit and causes the eye to

A

look down/depression of eyeball

47
Q

CN IV trochlear nucleus receives axons from

A

BA 8 of cortex, superior colliculus and inferior longitudinal colliculus

48
Q

CN VI abducens n function (LR6)

A

somatic motor nerve supplying lateral rectus muscle

49
Q

CN VI nuclei and ganglia

A

abducens nucleus

50
Q

CN VI abducens nucleus receives axons from

A

BA 8 of cortex, superior colliculus and inferior longitudinal colliculus

51
Q

CN VI penetrates the dura, travels along cavernous sinus and exits the skull through the SO4 and innervates the

A

lateral rectus muscle

52
Q

eyelid droops due to weakness of levator palpebrae

A

ptosis

53
Q

inability to constrict pupil as well as loss of light and accomodation reflexes

A

internal ophthalmoplegia

54
Q

CN V function

A

sensory - face and tongue

motor - mastication “tic douloureux”

55
Q

CN V nuclei and ganglia

A

gasserian semilunar or trigeminal ganglion “trigeminal neuralgia”

56
Q

great sensory nerve of the face

A

trigeminal CN V

57
Q

largest of the cranial nerves

A

trigeminal CN V

58
Q

CN V nucleus of origin

A

trigeminal motor nucleus

59
Q

one peripheral ganglion associated with CN V

A

trigeminal semilunar ganglion

60
Q

three peripheral branches of trigeminal nerve

A

ophthalmic, maxillary, mandibular

Part 1 Boards Spinal (13 decks)

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