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Neuroscience > Exam Two - GSA for Cranial Nerves > Flashcards

Exam Two - GSA for Cranial Nerves Flashcards

1
Q

All somatosensory fibers from cranial nerves return to the sensory nuclei of the ________, regardless of the cranial nerve origin

A

trigeminal nerve

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2
Q

GSA fibers of vagus carry…

A

pain, temp, and touch sensations from the posterior cranial fossa, post. ear, external auditory meatus, pharynx, and posterior and the external surface of the tympanic membrane

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3
Q

GSA fibers from 9 carry…

A

general sensory info (pain, temp, touch) from the skin of external ear, internal surface of typanic membrane, walls of upper pharynx, and post 1/3 of tongue, anterior surface of epiglottis and vallecula

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4
Q

Which nerve controls the muscles of facial expression and the stapedius muscle?

A

facial

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5
Q

which nerve controls the activity of most of the glands of the head (except parotid)?

A

facial

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6
Q

which nerve carries taste from the anterior 2/3 of tongue?

A

facial

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7
Q

Where do the GSA fibers of facial nerve originate?

A

originate in pain, temp, and tactile receptors of a small area of skin near the external ear

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8
Q

Where are the cell bodies located for the GSA portion of facial nerve?

A

geniculate ganglion

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9
Q

where do the GSA fibers of facial nerve terminate?

A

principal and spinal trigem nuclei

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10
Q

Where fo the SVE fibers of facial nerve originate?

A

facial motor nucleus in the pons

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11
Q

What are the SVE fibers of facial nerve responsible for?

A

form the motor root of NC 7 that supplies the muscles of facial expression

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12
Q

Where is the nucleus of facial CN located?

A

caudal pons

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13
Q

The caudal pans contains the cell bodies of ______ fibers of CN7

A

SVE
(innervate muscles of facial expression and stapedius)
- contains a subnucleus for each muscle it supplies
- receives input from cortex and other CN

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14
Q

direct input from the cerebral cortex to facial CN is via the ________________

A

corticobulbar tracts

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15
Q

subnuclei supplying muscles from the ______ receive inputs from the corticobulbar tracts of both sides

A

upper half of the face

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16
Q

subnucleir supplying muscles of the ______ receive corticobulbar inputs only from the contralateral side

A

lower half of the face

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17
Q

facial CN receives input from other CN nuclei which are important in ________

A

reflexes

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18
Q

facial CN receives input from other CN nuclei which are important in what reflexes

A
  • input from sensory nuclei of CN 5 (sucking reflex in babies)
  • inputs from the superior olivary nucleus (reduce loud noise by contracting stapedius)
  • inputs from the superior colliculus ( closure of the eyelids in response to bright light or a rapidly approaching object)
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19
Q

unilateral lesions of CN 7

A
  • paralysis of muscles of facial expression on ipsilateral side of the face
  • absence of secretions from the lacrimal gland of the ipsilateral eye
  • sensitivity to loud sounds ipsilaterally
  • no secretions from the sublingual and submandibular glands
  • loss of taste on ant 2/3 tongue and palate
  • ipsilateral absence of mucous secretions (drying) of nose)
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20
Q

sensory information from craniofacial structures including oral and nasal cavity

A

GSA CN 5

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21
Q

face, scalp and top of head

A

GSA CN 5

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22
Q

conjunctiva, tounge, teeth, external portion of tympanic membran

A

GSA CN 5

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23
Q

TMJ

A

GSA CN 5

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24
Q

meninges of ant and post cranial fossa

A

GSA CN 5

25
Q

innervates muscles of mastication

A

SVE CN 5

26
Q

tensor tympani, tensor palatini, mylohyoid, ant belly diagastric

A

SVE CN 5

27
Q

What are the peripheral components of the trigem nerve?

A
  • opthalmic
  • maxillary
    -mandibular
  • semilunar
  • sensory and motor roots
28
Q

central components of the trigem nuclei in brainstem

A

mesencephalic
pontine (principal)
spinal
motor

29
Q

The cell bodies of trigeminal primary afferent neurons are in the…

A

trigeminal ganglion and mesencephalic nucleus

30
Q

the central processes of trigem ganglion neurons form the large _______ of the trigem nerve before entering the pons

A

sensory root

31
Q

second order neurons for trigem system are in the brainstem’s

A

trigem sensory nucleir

32
Q

ascending branches from first order neuron (trigem) terminate in the ___________ located in the pons

A

principle sensory nucleus

33
Q

decending branches of trigem form the _______-

A

spinal tract of trigem

34
Q

the principle sensory nucleus, the trigem mesencephalic nucleus and their connections are primarily involved in…

A

tactile discrimination, proprioception, and kinesthesia from the head

35
Q

mesencephalic and principle trigem is like DCML or ALS?

A

DCMS

36
Q

spinal trigem is like DCML or ALS?

A

ALS

37
Q

mesencephalic nucleus purpose

A

proprioception and muscle stretch reflex

38
Q

pontine nucleus purpose

A

discriminative touch, vibration and proprioception

39
Q

spinal trigem purpose

A

thermal, non-discriminative tactile, nociceptive inputs

40
Q

motor trigem purpose

A

SVE and muscle stretch reflex (jaw jerk)

41
Q

the principle sensory trigem nucleus is divided into the:

A
  • dorsomedial division
  • ventrolateral division
42
Q

second order neurons in the anterior trigeminothalamic tract relays discriminative tactile info from the _________ to the ________

A

head, VPM

43
Q

dorsomedial division

A

input from the oral cavity

44
Q

ventrolateral division

A

input from all 3 components of trigem

45
Q

neurons in the VL part of the principle sensory nucleus project to the ________ along with fibers from the _______ trigem nucleus. this combined ascending projection forms the __________

A

contralateral VPM, spinal
anterior trigemino-thalamic tract

46
Q

neurons in the dorsomedial division of the principle sensory nucleus project to the _______

A

ipsilateral VPM - posterior dorsal trigemino-thalamic tract

47
Q

the afferent projections from the principal terminate _________ within the _________.
oral cavity is represented _______
external facial structures represented ___________-

A

somatotopically, VPM
medially
laterally

48
Q

____________ project via the posterior limb of the IC to S1 in the postcentral gyrus

A

third order thalamocortical neurons

49
Q

____ have the highest peripheral innervation density, and largest representation in the postcentral gyrus

A

perioral regions

50
Q

the primary afferent neurons for the mesencephalic trigemthalamic trac are located in the…

A

trigem mesencephalic nucleus

51
Q

mesencephalic tract fibers connect to….

A

trigem motor neurons
reticular formation
spinal trigeminal nucleus
cerebellum

52
Q

blood supply for the thalamus

A

thalamogeniculate arteries

53
Q

thalamogeniculate arteries are a branch of which artery?

A

PCA

54
Q

compromise of the thalamogeniculate arteries result in the loss of tactile sensation from the…

A

contralateral body and head

55
Q

GSA from facial?

A

small area behind ear

56
Q

GSA from glossopharyngela

A

GSA to post 1/3 tongue, skin of external ear, internal surface of tympanic membrane, external membrane

57
Q

GSA from vagus

A

skin back of ear, external acoustic meatus, external surface of tympanic membrane and pharynx

58
Q

shingles is a viral disease with ______. after a bout of chickenpox, viral DNA becomes latent in ____________.

A

dermatomal distribution, trigem ganglia and DRG cells

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