CN V and VII Flashcards Preview

Anatomy > CN V and VII > Flashcards

Flashcards in CN V and VII Deck (55):
1

what are the 3 divisions of CN V

V1 - opthalmic (sensory)
V2 - maxillary (sensory)
V3 - mandibular (sensory and motor)

2

what muscles does CN V3 provide motor innervation for ?

muscles of mastication and tensor tympani and tensor palatini (MOM and twins)

3

what is the main general sensory crainal nerve of the head

CN V

4

at what level of the brainstem would you be able to find the trigeminal main sensory nucleus, and trigeminal motor nucleus ?

midpons

5

what are the 2 ascending projections of CN V

trigeminal spinal nucleus, main trigeminal sensory nucleus

6

what is the path of the ascending trigeminal spinal nucleus ?

contralateral projection to VPM of thalamus, synapses then to postcentral gyrus

7

the postcentral gyrus is found on what lobe ?

parietal lobe area 3,1,2

8

the main trigeminal sensory nucleus is responsible for sensing what ?

discriminative touch, vibration, and proprioception of jaw

9

what major tract or pathway is the trigeminal main sensory nucleus a homologue of ?

posterior collumn/medial lemniscus pathway

10

there are 2 individual ascending pathways that make up the trigeminal main sensory nucleus, what are there differences

-one CROSSES midline then joins medial lemniscus pathway to the VPL then to postcentral gyrus
-one stays UNCROSSED and ipsilaterally ascends to VPM

11

the trigeminal spinal nucleus is responsible for sensing what ?

pain, temperature, crude touch

12

what are the 3 divisions of the trigeminal spinal nucleus

pars oralis (oral nucleus)
pars interpolaris (interpolar nucleus)
pars caudalis (caudal nucleus)

13

what division of the trigeminal spinal nucleus is responsible for sensing pain and temperature and crude touch

pars caudalis

14

what is the pars interpolaris division of the trigeminal spinal nucleus responsible for sensing ?

trigemino-autonomic reflexes

15

what nucleus of CN V would be found in a cross section of the midbrian

trigeminal mesencephalic nucleus

16

the when second order neurons of the trigeminal spinal nucleus cross the midline, what significant path/tract do they join ?

Anterolateral pathway/spinothalamic tract

17

where does the anterolateral/spinothalamic tract terminate ?

VPM of thalamus, synapses and ascends to postcentral gyrus

18

explain the "onion peel" representation, and what nuclei/origin of the trigeminal nerve is it referring to ?

Referring to pars caudalis of trigeminal spinal nucleus
-type of somatotopic organization (inverted face representation) where V1 division ends most vetral in posterior horn and V3 ends most dorsal

19

what would cause the largest amount of sensory loss, an injury to the most dorsal aspect of the trigeminal spinal tract or most ventral ?

injury to the dorsal aspect would cause the most sensory loss

20

75 percent of sensory fibers in the tooth pulp sense what ? the remaining 25 % sense ?

pain, temperature
-touch and pressure

21

what is trigeminal neuroglia

brief episodes of excruciating pain in the dist. of one or more division of the trigeminal nerve

22

what division of the trigeminal nerve is usually associated with trigeminal neuralgia

V3

23

what are the characteristics of trigeminal neuralgia

-no sensory trouble b/w attacks
-tactile stimulus can trigger attacks
-due to compression of trigeminal nerve and vasculature

24

what do they do today to treat trigeminal neuralgia

microvascular decompression to relieve pressure on nerve and vessels around it

25

what trigeminal nerve nuclei contains unipolar neurons

trigeminal mesencephalic nucleus

26

the trigeminal mesencephalic nucleus is responsible for sensing what ?

proprioception of MOM, mechanorececeptors of mouth and gingiva

27

what peripheral nucleus of the trigeminal nerve is known as the masticatory generator

supra-trigeminal nucleus

28

what nuclei of the trigeminal nerve is responsible for controlling the occlusal vertical dimension ?

trigeminal mesencephalic nucleus

29

at the CNS origin of the trigeminal nerve, which nuclei at the midpons level would be more lateral, main sensory nucleus or motor nucleus

main sensory nucleus = lateral

30

the trigeminal mesencephalic nuclues follows/joins what significant pathway/tract

Posteriolateral collumn/medial lemniscus pathways

31

which nuclei of the trigeminal nerve have axons that are heavily myelinated

main sensory nucleus and mesencephalic nucleus

32

which nuclei of the trigeminal nerve has axons that are lighty to no myelination

trigeminal spinal nucleus (pain and temperature)

33

what nuclei is involved with stretch reflexes from V2 and V3

trigeminal mesencephalic nucleus

34

what is the function of the trigeminal motor nucleus and what division of the trigeminal nerve does it correspond to

V3-responsible for innervation of MOM and tensor twins, and jaw CLOSURE

35

what is the afferent limb of the jaw-jerk reflex, what is the efferent limb ?

afferent is mesencephalic nucleus and efferent is motor nucleus

36

the jaw-jerk reflex is what type of reflex ?

monosynaptic

37

what is the function of the stapedius m and what is it innervated by

modulate sound volume, CN VII

38

what innervation does CN VII have on taste

innervates anterior 2/3 of tounge, CN IX does posterior 1/3

39

the geniculate ganglion is involved with motor or sensory nuclei for CN VII

sensory

40

what action does CN VII have on MOM

closes eyes and closes lips

41

CN VII visceral motor fibers can send motor efferents to what glands via what ganglia ?

salivatory, lacrimal, submandibular, sublingual, palatine glands via submandibular ganglion, pterygopalatine ganglion, and superior salivatory nucleus

42

the somatic sensory portion of CN VII recieves impulses from where ? and would synapse where ?

receive from outer ear and synapse on geniculate ganglion and trigeminal spinal nucleus

43

the visceral sensory portion of CN VII receives impulses from where and synapses where ?

from anterior 2/3 of tongue and synapses at geniculate ganglion and solitory tract nucleus

44

the facial motor nucleus is a homologue with what other major pathway

corticobulbar pathway

45

what is the difference b/w motor innervation to the upper and lower face

-upper face innervated bilaterally via CN VII
-lower face innervated contralaterally via CN VII

46

a lesion in the left corticobulbar pathway would result in damage where ?

weakness in lower right facial muscles

47

what is Bell's Palsy

unilateral facial paralysis due to shitty CN VII

48

what is the afferent and efferent limbs of the corneal blink reflex

afferent is V1
effernt is VII

49

what is the afferent and efferent limbs of jaw opening and jaw closing reflexes

input V
output V3

50

what is the afferent and efferent limbs of the blink to light reflex

afferent is CN II
efferent is motor CN VII

51

what is the afferent and efferent limbs of the blink to noise reflex

afferent is cochlear nucleus
efferent is motor CN VII

52

what is the afferent and effernt limbs of the sound attenuation reflex

afferent is cochlear nucleus
efferent is motor CN VII

53

what effect does CN X have on taste

provides innervation to epiglottis

54

all sensory input from the taste buds goes to what nuclei ?

solitary tract nucleus

55

what is the principal visceral sensory nucleus of the brainstem

nucleus of the solitary tract