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PNS #2 > CN IX > Flashcards

CN IX Flashcards

1
Q

What is the name of CN IX?

A

Glossopharyngeal nerve

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2
Q

What number is the glossopharyngeal nerve?

A

IX

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3
Q

What kind of fibers does the glossopharyngeal nerve carry?

A

motor
sensory
autonaumic

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4
Q

How is CN IX classified?

A

mixed

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5
Q

What do the motor fibers of the glossopharyngeal nerve supply?

A

stylopharyngeus muscle

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6
Q

What sensory info does CN IX carry?

A

from the pharynx

TASTE from posterior tongue

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7
Q

What glands do the parasympathetic autonaumic fibers innervate?

A

parotid and others

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8
Q

Where do the motor fibers of the glossopharyngeal nerve arise (cell body location)?

A

superior part of the nucleus ambiguus

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9
Q

What CN’s have fibers originating in the nucleus abiguus?

A

IX, X, XI

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10
Q

What are brachiomotor muscles derived from?

A

branchial arches

NOT somites

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11
Q

Where do the afferent sensory fibers of the glossopharyngeal nerve terminate?

A

solitary nucleus (–>CN VII)

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12
Q

How many peripheral ganglia are associated with CN IX?

A

two

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13
Q

What peripheral ganglia are associates with CN IX?

A

superior ganglia

inferior ganglia

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14
Q

Of the two peripheral ganglia are smaller and thought of as a separate extension the other larger ganglia?

A

superior ganglia

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15
Q

What is another name for the inferior ganglion?

A

petrosal ganglion

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16
Q

What are the general sensory branches of the glossopharyngeal nerve?

A 
nasopharynx
oropharynx
portion of the tongue posterior to the sulcus terminalis
uvula
palatine tonsils
tympanic cavity
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17
Q

Where are the general sensory cell bodies of CN IX found?

A

inferior ganglion

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18
Q

Where do general sensory fibers from the inferior ganglion synapse?

A

spinal nucleus of the trigeminal nerve

also carries pain and proprioception

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19
Q

How is taste info carried in CN IX?

A

neurons from the inferior ganglion

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20
Q

Where do the taste neurons of CN IX synapse?

A

superior part of the solitary nucleus

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21
Q

What information is carried from the inferior ganglion to the lower part of the solitary nucleus (CN IX)?

A

visceral afferent from the carotid sinus and carotid body

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22
Q

What are the two nuclei of termination for CN IX?

A

spinal nucleus of trigeminal nerve

solitary nucleus

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23
Q

What foramen does the glossopharyngeal nerve pass through that also splits the superior and inferior ganglia?

A

jugular foramen

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24
Q

What CN’s does the nucleus abiguus contribute LMN’s to?

A

IX, X, XI

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25
Q

LMN’s of CN IX innervate what muscle?

A

stylopharyngeus

26
Q

How many muscles does CN IX innervate?

A

one

27
Q

What does the inferior salivary nucleus of CN IX give rise to?

A

perganglionic parasympathetic

28
Q

What do the preganglionic parasympathetic fibers of CN IX give rise to?

A

otic ganglion

29
Q

What does the otic ganglion give rise to?

A

postganglionic fibers supplying parotid glands, buccal glands, inferior labial glands

30
Q

What is the apparent origin of the glossopharyngeal nerve?

A

lateral aspect of the superior part of the medualla oblongata

31
Q

How does CN IX leave is apparent origin?

A

as a series of rootlets

32
Q

Where is the superior ganglia located?

A

inside the cranium before the jugular foramen

33
Q

Where is the inferior ganglia located?

A

outside the cranium (jugular foramen)

34
Q

What is the jugular foramen divided by?

A

a septum into anterior and posterior parts

35
Q

What part of the jugular foramen does CN IX exit?

A

the posterior part

36
Q

What does the tympanic nerve arise from?

A

the inferior ganglion

37
Q

What kind of fibers does the tympanic nerve carry?

A

preganglionic parasympathetic fibers

sensory fibers

38
Q

What does the tympanic nerve pass through?

A

tympanic canaliculus (canal) into the tympanic cavity

39
Q

What happens to the tympanic nerve in the tympanic cavity?

A

it receives postganglionic sympathetic fibers from the superior cervical ganglion

40
Q

What does the new combination in the tympanic cavity form?

A

the tympanic plexus

41
Q

What does the tympanic plexus carry?

A

somatosensory info from the tympanic cavity, pharyngotympanic (eustation) tube, mastiod air cells

42
Q

How do the preganglionic parasympathetic fibers of CN IX travel?

A

pass THROUGH the tympanic plexus reform as the LESSER PETROSAL NERVE, goes through the lesser petrosal canal to the otic ganglia

43
Q

What kind of fibers are in the lesser petrosal nerve?

A

preganglionic parasympathetic

44
Q

What does the lesser petrosal nerve travel through?

A

the lesser petrosal canal

45
Q

Where are postganglionic parasympathetic fibers from the otic ganglion carried?

A

branches of CN V

46
Q

What do the postganlionic parasympathetic fibers from the otic ganglion in branches of CN V supply?

A

parotid, buccal, and inferior labial glands

via: buccal and inferior alveolar nerves

47
Q

How does the carotid branch enter the glossopharyngeal nerve?

A

ascends from below and enters the nerve @ inferior ganglion

48
Q

What type of information does the carotid branch carry?

A

affarent information from the chemoreceptors in the carotid body and baroreceptors in the carotid sinus

49
Q

Where are the cell bodies for the carotid branch found?

A

inferior ganglion

50
Q

Where do the carotid branches synapse?

A

inferior part of the solitary nucleus

51
Q

Where else can chemoreceptor info and baroreceptor info be carried?

A

in the vagus nerve

52
Q

What sensory info does the pharyngeal branches carry?

A

mucosa of the pharynx

53
Q

What do the pharyngeal branches combine with?

A

some vagal branches

54
Q

What do hte pharyngeal and vagal branches form near the middle pharyngeal plexus?

A

the pharyngeal plexus

55
Q

What does the muscular branch of the glossopharyngeal nerve supply?

A

stylopharyngeus muscle

56
Q

Where do the last branches of the glossopharyngeal nerve reach?

A

the oral cavity

57
Q

What do the tonsilar branches of the glossopharyngeal nerve carry?

A

sensory info from the palatine tonsils and oral mucosa

58
Q

What do the lingual branches of the glossopharyngeal nerve carry?

A

general sensory and taste info from the tongue, posterior to the sulcus terminalis
-hot, cold, pain

59
Q

What taste information will be lost by damage to the glossopharyngeal nerve?

A

bitter and sour taste

60
Q

What other clinical things will be seen with damage to the glossopharyngeal nerve?

A

difficulty swallowing

test: gag reflex

PNS #2 (7 decks)

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