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Neuro > Cranial Nerves (Sensory) > Flashcards

Cranial Nerves (Sensory) Flashcards

1
Q

Which types of fibers are closest to the sulcus limitans in the brainstem and spinal cord?

A

Visceral Fibers

SVE/SVA in brainstem and GVE/GVA in spinal cord

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2
Q

Where are sensory fibers located in the brainstem?

A

lateral (alar plate opens up)

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3
Q

Where are sensory fibers located in the spinal cord?

A

posterior to the sulcus limitans

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4
Q

How does sensory information from the nose reach the brain structures?

A

Send fine axons through cribriform plate to synapse in the olfactory bulb → axons of projection neurons in bulb travel as olfactory tract to synapse in olfactory cortex, amygdala, and related forebrain structures

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5
Q

Axons of what cell type make up the optic nerve?

A

retinal ganglion cells

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6
Q

What percent of optic nerve fibers cross over int he optic chiasm?

A

50%

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7
Q

What are the two paths of the Optic Tract?

A
  • Lateral geniculate body (visual thalamus) which projects to the primary visual cortex (around the calcarine fissure)
  • Brachium of the superior colliculus to synapse there for startle reflexes
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8
Q

Where is the chief sensory nucleus of V?

A

rostral pons

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9
Q

What fibers feed into the chief sensory nucleus of V?

A

V, VII, IX

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10
Q

What type of sensation is brought back to the chief sensory nucleus of V?

A

Epicritic = fine touch/ vibration sensations

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11
Q

CN V afferent fibers feeding in to the chief sensory nucleus of V are from what ganglion?

A

Trigeminal Ganglion

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12
Q

CN VII afferent fibers feeding in to the chief sensory nucleus of V are from what ganglion?

A

Geniculate Ganglion

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13
Q

CN IX afferent fibers feeding in to the chief sensory nucleus of V are from what ganglion?

A

Inferior and Superior Glossopharyngeal Ganglion

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14
Q

What happens after fibers from V, VII, and IX synpase int he chief sensory nucleus of V?

A

secondary neurons travel to the contralateral Trigeminal Leminiscus to the VPM of Thalamus→ Primary somatosensory cortex

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15
Q

CN V carries epicritic information from where to the chief sensory nucleus?

A

face

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16
Q

CN VII carries epicritic information from where to the chief sensory nucleus?

A

around the ext. auditory meatus

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17
Q

CN IX carries epicritic information from where to the chief sensory nucleus?

A

Posterior 1/3 tongue, pharynx, tonisls, tympanum, and small area of external ear

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18
Q

What is the only instance in which primary sensory neurons (pseudounipolar) reside within the CNS instead of a peripheral ganglion?

A

Mesencephalic Nucleus

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19
Q

What information is passed to the mesencephalic nucleus?

A

Proprioceptive information from muscles of mastication

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20
Q

What does the mesencephalic information do with the proprioceptive information?

A

Passes it to the reticular formation, cerebellum, and motor nucleus of V (stretch reflexes).

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21
Q

Where is the spinal nucleus of V?

A

extends from mesencephalon to spinal cord to be continuous with substantia gelatinosa

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22
Q

What information is carried to the spinal nucleus of V?

A

Pain and temperature afferents (protopathic)

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23
Q

What fibers synapse at the spinal nucleus of V? What somatotopy?

A

Afferents from V1 (anterior)
Afferents from V2
Afferents from V3
Afferents from VII, IX, and X (posterior)

24
Q

CN V afferent fibers feeding in to the spinal nucleus of V are from what ganglion?

A

Trigeminal Ganglion

25
Q

CN VII afferent fibers feeding in to the spinal nucleus of V are from what ganglion?

A

Geniculate Ganglion

26
Q

CN IX afferent fibers feeding in to the spinal nucleus of V are from what ganglion?

A

Inferior and Superior Glossopharyngeal

27
Q

CN X afferent fibers feeding in to the spinal nucleus of V are from what ganglion?

A

Inferior and Superior Vagal

28
Q

What happens with fibers after synpasing at the spinal nucleus of V?

A

secondary fibers pass the contralateral Trigeminothalamic tract to the VPM of Thalamus→ Primary somatosensory cortex

29
Q

CN V carries protopathic information from where to the spinal nucleus of V?

A

face

30
Q

CN VII carries protopathic information from where to the spinal nucleus of V?

A

around the ext. auditory meatus

31
Q

CN IX carries protopathic information from where to the spinal nucleus of V?

A

posterior 1/3 tongue, pharynx, tonsils, tympanum, small bit of external ear

32
Q

CN X carries protopathic information from where to the spinal nucleus of V?

A

small bit of external ear

33
Q

Which CN ganglia is responsibe for receiving taste afferents?

A

Gustatory Nucleus (rostral Nucleus Solitarius in medulla)

34
Q

What CN fibers feed in to the Gustatory Nucleus?

A

CN VII, IX, and X

35
Q

CN VII carries taste information from where to the gustatory nucleus?

A

anterior 2/3 of tongue

36
Q

CN IX carries taste information from where to the gustatory nucleus?

A

posterior 1/3 of tongue

37
Q

CN X carries taste information from where to the gustatory nucleus?

A

pharynx and epiglottis

38
Q

CN VII afferent fibers feeding in to the gustatory nucleus are from what ganglion?

A

geniculate

39
Q

Where do secondary fibers go after synapsing in the gustatory nucleus?

A

Go to the ipsilateral VPM→ somatosensory cortex for taste

40
Q

What CN nucleus is responsible for chemo- and baro-reception sensing?

A

Cardiorespiratory Nucleus (caudal Nucleus Solitarius)

41
Q

What CN fibers feed to the Cardiorespiratory Nucleus?

A

CN IX and X

42
Q

CN IX carries visceral information from where to the cardiorespiratory nucleus?

A

Carotid Body (chemoreceptors) and Carotid Sinus (baroreceptors)

43
Q

CN X carries visceral information from where to the cardiorespiratory nucleus?

A

Aortic Arch (stretch receptors) and Aortic Bodies (chemoreceptors)

44
Q

Where do secondary fibers go after synpase int he cardiorespiratory nucleus?

A

Reticular formation and hypothalamus for reflex responses

45
Q

What nucleus receives input from inferior and superior vagal ganglion neurons that carry sensation from pharynx and larynx?

A

spinal nucleus of V

46
Q

Where is the vestibular nuclei?

A

pons and rostral medulla—near floor of the 4th ventricle

47
Q

Where are the afferents going to the vestibular nuclei located?

A

Hair Cells in saccule, utricle & 3 semiciruclar canals which synapse on cells in the vestibular (Scarpa’s) ganglion

48
Q

How many vestibular nuclei are there?

A

4: Lateral, Medial, Inferior, and Superior

49
Q

Fibers from which vestibular nuclei make up the Lateral Vestibulospinal tract?

A

lateral

50
Q

Fibers from which vestibular nuclei make up the Medial Vestibulospinal tract?

A

medial and inferior

51
Q

Fibers from which vestibular nuclei make up the MLF?

A

medial and superior

52
Q

The lateral vestibulospinal tract carries what information?

A

Balance and Extensor tone

53
Q

The medial vestibulospinal tract carries what information?

A

Control of head and neck position

54
Q

The MLF carries information for what?

A

coordinating eye movements

55
Q

Where is the cochlear ganglia?

A

pons

56
Q

Where are the afferents going to the cochlear nuclei located?

A

Hair Cells in the Organ of Corti (cochlea= inner ear) with body in the spiral ganglion.

57
Q

Where do secondary fibers from the cochlear nuclei go?

A

Auditory pathways ascend bilaterally to inferior colliculus → medial geniculate → Heschel’s gyrus (superior temporal lobe) for hearing

Neuro (10 decks)

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