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CN V and VII Flashcards

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1
Q

what are the 3 divisions of CN V

A

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

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2
Q

what muscles does CN V3 provide motor innervation for ?

A

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

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3
Q

what is the main general sensory crainal nerve of the head

A

CN V

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4
Q

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

A

midpons

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5
Q

what are the 2 ascending projections of CN V

A

trigeminal spinal nucleus, main trigeminal sensory nucleus

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6
Q

what is the path of the ascending trigeminal spinal nucleus ?

A

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

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7
Q

the postcentral gyrus is found on what lobe ?

A

parietal lobe area 3,1,2

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8
Q

the main trigeminal sensory nucleus is responsible for sensing what ?

A

discriminative touch, vibration, and proprioception of jaw

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9
Q

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

A

posterior collumn/medial lemniscus pathway

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10
Q

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

A
  • one CROSSES midline then joins medial lemniscus pathway to the VPL then to postcentral gyrus
  • one stays UNCROSSED and ipsilaterally ascends to VPM
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11
Q

the trigeminal spinal nucleus is responsible for sensing what ?

A

pain, temperature, crude touch

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12
Q

what are the 3 divisions of the trigeminal spinal nucleus

A 
pars oralis (oral nucleus)
pars interpolaris (interpolar nucleus)
pars caudalis (caudal nucleus)
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13
Q

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

A

pars caudalis

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14
Q

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

A

trigemino-autonomic reflexes

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15
Q

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

A

trigeminal mesencephalic nucleus

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16
Q

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

A

Anterolateral pathway/spinothalamic tract

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17
Q

where does the anterolateral/spinothalamic tract terminate ?

A

VPM of thalamus, synapses and ascends to postcentral gyrus

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18
Q

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

A

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

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19
Q

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

A

injury to the dorsal aspect would cause the most sensory loss

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20
Q

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

A

pain, temperature

-touch and pressure

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21
Q

what is trigeminal neuroglia

A

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

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22
Q

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

A

V3

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23
Q

what are the characteristics of trigeminal neuralgia

Study These Flashcards
A
  • no sensory trouble b/w attacks
  • tactile stimulus can trigger attacks
  • due to compression of trigeminal nerve and vasculature
24
Q

what do they do today to treat trigeminal neuralgia

Study These Flashcards
A

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

Anatomy (35 decks)

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