Cranial Nerves (Sensory) Flashcards Preview

Neuro > Cranial Nerves (Sensory) > Flashcards

Flashcards in Cranial Nerves (Sensory) Deck (57):
1

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

Visceral Fibers
(SVE/SVA in brainstem and GVE/GVA in spinal cord)

2

Where are sensory fibers located in the brainstem?

lateral (alar plate opens up)

3

Where are sensory fibers located in the spinal cord?

posterior to the sulcus limitans

4

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

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

5

Axons of what cell type make up the optic nerve?

retinal ganglion cells

6

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

50%

7

What are the two paths of the Optic Tract?

-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

8

Where is the chief sensory nucleus of V?

rostral pons

9

What fibers feed into the chief sensory nucleus of V?

V, VII, IX

10

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

Epicritic = fine touch/ vibration sensations

11

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

Trigeminal Ganglion

12

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

Geniculate Ganglion

13

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

Inferior and Superior Glossopharyngeal Ganglion

14

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

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

15

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

face

16

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

around the ext. auditory meatus

17

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

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

18

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

Mesencephalic Nucleus

19

What information is passed to the mesencephalic nucleus?

Proprioceptive information from muscles of mastication

20

What does the mesencephalic information do with the proprioceptive information?

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

21

Where is the spinal nucleus of V?

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

22

What information is carried to the spinal nucleus of V?

Pain and temperature afferents (protopathic)

23

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

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

24

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

Trigeminal Ganglion

25

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

Geniculate Ganglion

26

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

Inferior and Superior Glossopharyngeal

27

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

Inferior and Superior Vagal

28

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

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

29

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

face

30

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

around the ext. auditory meatus

31

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

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

32

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

small bit of external ear

33

Which CN ganglia is responsibe for receiving taste afferents?

Gustatory Nucleus (rostral Nucleus Solitarius in medulla)

34

What CN fibers feed in to the Gustatory Nucleus?

CN VII, IX, and X

35

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

anterior 2/3 of tongue

36

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

posterior 1/3 of tongue

37

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

pharynx and epiglottis

38

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

geniculate

39

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

Go to the ipsilateral VPM→ somatosensory cortex for taste

40

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

Cardiorespiratory Nucleus (caudal Nucleus Solitarius)

41

What CN fibers feed to the Cardiorespiratory Nucleus?

CN IX and X

42

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

Carotid Body (chemoreceptors) and Carotid Sinus (baroreceptors)

43

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

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

44

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

Reticular formation and hypothalamus for reflex responses

45

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

spinal nucleus of V

46

Where is the vestibular nuclei?

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

47

Where are the afferents going to the vestibular nuclei located?

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

48

How many vestibular nuclei are there?

4: Lateral, Medial, Inferior, and Superior

49

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

lateral

50

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

medial and inferior

51

Fibers from which vestibular nuclei make up the MLF?

medial and superior

52

The lateral vestibulospinal tract carries what information?

Balance and Extensor tone

53

The medial vestibulospinal tract carries what information?

Control of head and neck position

54

The MLF carries information for what?

coordinating eye movements

55

Where is the cochlear ganglia?

pons

56

Where are the afferents going to the cochlear nuclei located?

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

57

Where do secondary fibers from the cochlear nuclei go?

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