Cranial nerves Flashcards Preview

Block 5 module 3 COPY > Cranial nerves > Flashcards

Flashcards in Cranial nerves Deck (83):
1

all the nuclei are located in the brainstem except CN

I, II, XI

2

CN I, II, VIII are devoted to

special sensory input

3

purely motor

III, IV, VI, XI, XII

4

purely sensory

I, II, VIII

5

mixed

V, VII, IX, X

6

CN III, IX, and X carry

sympathetic fibers

7

CN located in diencephalon

I, II

8

CN located in midbrain

III and IV

9

CN located in pons

V, VI VII VIII

10

CN located in medulla

IX, X, XI, XII

11

innervates striated muscles that are somite derivatives

somatic efferent (GSE)
CN III IV VI

12

innervate branchial arches derivatives

SVE/ branchial efferent V, VII, IX, X, XI

13

preganglionic parasympathetic components of cranial
division

GVE

14

convey sensation from the alimentary tract, heart, vessels
and lungs by way of nerves IX and X.

GVA IX, X

15

convey sensation from the skin and the mucous membranes
of the head (mainly CN V)

GSA

16

found in CN I (smell), CN II (vision) and CN VIII (hearing and
equilibrium)

SSA

17

most primitive of all CN

CN I

18

CN I does not pass thru

thalamus

19

2 parts of CN I

olfactory bulb
olfactory stalk

20

olfactory stalk carries

afferent axons

21

olfactory bulb lies above the

cribriform plate

22

CN I terminates in

primary olfactory cortex and entorhinal cortex

23

CNI pathway

receptor cells - olfactory nerves - O bulb, O stalk, anterior olfactory nucleus

24

olfactory cells are surrounded by _______ with bowman's glands that secrete _____

sustentacular cells; mucus

25

_____ are the ones that respond to olfactory chemical stimuli

olfactory cilia

26

2 type of interneurons of olfacotry bulb

periglomerular cells
granule cells

27

receives signals from olfactory sensory neurons an
centrifugal fibers

periglomerular cells

28

most numerous interneurons

granule cells

29

most characteristic feature of the
olfactory bulb in all vertebrates where these elements interact

olfactory glomeruli

30

(SYNAPTIC TRIAD):

a. olfactory axon (input fiber)
b. mitral and tufted cells (principal neurons)
c. periglomerular cell (intrinsic neuron)

31

the olfactory tract/ stalk consists of central axons of the ________ of the
bulb and some centrifugal fibers from the opposite olfactory
bulb

mitral and tufted cells

32

regulate information flow between nearly every region where
odor information processing occurs.

Anterior Olfactory Nucleus

33

center of highest visual acuity

fovea

34

fovea is the center of

highest visual acuity

35

CN II optic nerve conveys visual impulses from the

retina

36

the optic nerve passes through the _____ to the orbit

optic papilla

37

the optic nerve becomes the optic tract after passing through the

optic chiasm

38

rods are for _______ vision

night (scotopic)

39

cones are for ____ vision

day (photopic)

40

CN III oculomotor nerve nucleus is located at

midbrain

41

CN III controls

eye movement, pupillary constriction

42

axons of oculomotor nucleus supplies all extraocular muscles
muscles except:

Superior oblique (CN IV) and lateral rectus
(CN V)

43

the superior oblique muscle intort the eye when the eye is _____

abducted

44

the superior oblique muscle _____ the eye when the eye is adducted

depress

45

the only crossed cranial nerve

trochlear

46

CN IV is the only one to leave the ____

posterior surface of the brainstem

47

CN IV Enters the ________ below CN III and exits the ______ to innervate the superior oblique

cavernous sinus; superior
orbital fissure

48

nerve of the 1st pharyngeal arch

CN V

49

3 div of CN V

opthalmic
maxillary
mandibular

50

the sensory root of CN V arises from the ________ which lies in the _______ lateral to the cavernous sinus

Gasserian ganglion; meckel's cavity

51

the opthalmic division enters the cranium through the

superior orbital fissure

52

maxillary div enters through the

foramen rotundum

53

mandibular div sonsory enters through the

foramen ovale

54

abducens nerve is pure _____

GSE nerve

55

CN VI innervates ______ which abduct the eye

lateral rectus

56

most frequently injured CN

CN VI

57

the abducens has the ____________ among CN

longest intracranial course

58

where abducent nerve hangs)

clivus

59

increased ICP leads to______ because _______-

bilateral nerve palsy; clivus pushed downward

60

the internuclear neurons of CN VI innervates

medial rectus

61

the ______ sends parasympathetic preganglionic
fibers to the _____ to innervate the _____ and via the chord tympani nerve to the submandibular and sublingual

nervus intermedius; pterygopalatine ganglion; lacrimal
gland

62

internal auditory meatus is the passageway for

CN VII and VIII

63

CN VII exits through the

styloid foramen

64

CN VII innervates the

muscle for facial expression

65

CN VIII arises from the _____ in the labyrinth of the inner ear

spiral and vestibular ganglion

66

CN VIII is confined to the

temporal bone

67

The primary auditory cortex (areas 41 and 42) includes the _______
on the upper surface of the superior temporal
gyrus.

gyrus of Heschl

68

CN IX contains branchial efferents from the ________ to the _________

nucleus ambiguous to the stylopharyngeus muscle

69

CN IX supplies general sensation to the

pharynx
soft palate
posterior 1/3 of tongue

70

CN XI innervates

head and shoulder movement and innervation of laryngeal muscles

71

2 components of CN XI

cranial
spinal

72

cranial component of CN XI form the

internal branches

73

spinal component of CN XI form the

external branches

74

the cranial component of CN xi innervates ________ and is regarded as a
component

branchiometric musculature; special visceral efferect (SVE)

75

the spinal component of CN XI innervates the

ipsilateral sternocleidomastoid muscle and
upper parts of the trapezius muscle.

76

Paralysis of the upper part of the trapezius muscle – results

shoulder drop

77

CN XII mediates

tongue movement

78

CN XII innervates

ipsilateral half of the tongue

79

CN XII nucleus is located

internal to trigonum hypoglossi

80

CN XII nucleus is surrounded by gray matter which contains

perihypoglossal nuclei

81

nucleus intercalatus is between

hypoglossal nucleus and motor nucleus of vagus

82

normal reflex consisting of retching; may be produced by
touching the soft palate in the back of the mouth

gag reflex

83

the movement of the eyes as a unit in the opposite direction
when the head is moved

doll's eye phenomenon