Cranial Nerves (21%) Flashcards Preview

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Flashcards in Cranial Nerves (21%) Deck (60):
1

CN I

olfactory

2

CN II

optic

3

CN III

oculomotor

4

CN IV

trochlear

5

CN V

trigeminal

6

CN V1

ophthalmic

7

CN V2

maxillary

8

CN V3

mandibular

9

CN VI

abducens

10

CN VII

facial

11

CN VIII

vestibular cochlear

12

CN IX

glossopharyngeal

13

CN X

vagus "wanderer"

14

CN XI

accessory

15

CN XII

hypoglossal

16

CN I olfactory foramen exit

cribriform plate

17

CN II optic foramen of exit

optic canal

18

CN III oculomotor foramen of exit

superior orbital fissure SOF

19

CN IV trochlear foramen of exit

superior orbital fissure SOF

20

CN V1 ophthalmic foramen of exit

superior orbital fissure SOF

21

CN V2 maxillary foramen of exit

foramen rotundum

22

CN V3 mandibular foramen of exit

foramen ovale

23

CN VI

superior orbital fissure SOF

24

CN VII facial mandibular foramen of exit

internal auditory meatus exits through styloid mastoid

25

CN VIII vestibular cochlear foramen of exit

internal auditory meatus

26

CN IX glossopharyngeal foramen of exit

jugular foramen (temporal and occipital = jugular)

27

CN X vagus foramen of exit

jugular foramen

28

CN XI accessory foramen of exit

jugular foramen

29

CN XII hypoglossal foramen of exit

hypoglossal canal

30

CN I function; nuclei and ganglia

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

loss of smell

anosmia

32

CSF leakage may indicate

skull fracture (cribriform plate damaged)

33

CN II optic function; nuclei and ganglia

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

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

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

lesion of optic nerve will result in loss of

vision of one eyeball

36

lesion of optic chiasma will result in

tunnel vision

37

lesion of optic tract will result in

loss of half of visual field

38

CN III oculomotor function

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

39

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

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

40

accessory oculomotor nucleus of CNIII is aka

edinger westfall nucleus

41

edinger westfall/accessory oculomotor nucleus supplies

ciliaris and pupillary constrictor

42

CN IV (trochlear n.) function (SO4)

somatic motor supplying superior oblique m.

43

CN IV (trochlear n) nuclei and ganglia

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

44

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

superior oblique muscle

45

CN IV has communication with what plexus

cavernous plexus

46

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

look down/depression of eyeball

47

CN IV trochlear nucleus receives axons from

BA 8 of cortex, superior colliculus and inferior longitudinal colliculus

48

CN VI abducens n function (LR6)

somatic motor nerve supplying lateral rectus muscle

49

CN VI nuclei and ganglia

abducens nucleus

50

CN VI abducens nucleus receives axons from

BA 8 of cortex, superior colliculus and inferior longitudinal colliculus

51

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

lateral rectus muscle

52

eyelid droops due to weakness of levator palpebrae

ptosis

53

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

internal ophthalmoplegia

54

CN V function

sensory - face and tongue
motor - mastication "tic douloureux"

55

CN V nuclei and ganglia

gasserian semilunar or trigeminal ganglion "trigeminal neuralgia"

56

great sensory nerve of the face

trigeminal CN V

57

largest of the cranial nerves

trigeminal CN V

58

CN V nucleus of origin

trigeminal motor nucleus

59

one peripheral ganglion associated with CN V

trigeminal semilunar ganglion

60

three peripheral branches of trigeminal nerve

ophthalmic, maxillary, mandibular