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PNS > CN IX > Flashcards

CN IX Flashcards

1
Q

What is the name for CN IX?

A

Glossopharyngeal (Go to Vegas)

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2
Q

What kind of fibers are carried by CN IX?

A

motor, sensory, and autonomic fibers

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3
Q

What muscle does CN IX send motor fibers to?

A

stylopharyngeus

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4
Q

What kind of info does CN IX carry from the pharynx?

A

sensory, including taste info from the posterior tongue

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5
Q

Where does CN IX send (ultimately) parasympathetic info?

A

parotid gland

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6
Q

Where are the cell bodies for motor fibers in CN IX?

A

nucleus ambiguus

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7
Q

Specifically, what kind of motor fibers are carried by CN IX?

A

Branchiomotor fibers

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8
Q

Where do branchiomotor fibers develop from embryologically?

A

pharyngeal arches or branchial fibers NOT somites

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9
Q

What is the nucleus of origin for preganglionic parasympathetic fibers carried in CN IX?

A

Inferior Salivatory Nucleus

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10
Q

Where do afferent sensory fibers of CN IX terminate?

A

solitary nucleus

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11
Q

What other CN is associated with the solitary nucleus?

A

CN VII

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12
Q

What two peripheral ganglia are associated with CN IX?

A

superior and inferior ganglion

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13
Q

T/F: the inferior ganglion is smaller and usually thought of as a separated part of the superior ganglion.

A

False; vice-versa (superior is smaller and thought to be a separated part of the inferior ganglion)

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14
Q

Where all is general sensory carried from in CN IX?

A

from nasopharynx, oropharynx, portion of the tongue posterior to sulcus terminalis, uvula, and palatine tonsils. (NO PT U PT or NOT U Please)

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15
Q

What cavity has general sensation carried in a branch of the glossopharyngeal nerve?

A

tympanic cavity

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16
Q

General sensation neurons carried in CN IX have cell bodies in which ganglion? Where do they synapse in the CNS?

A

inferior (Snell book says superior); spinal nucleus of the trigeminal
(this question is pending confirmation from Torgerud)

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17
Q

Taste info from posterior of the sulcus terminalis (posterior 1/3 of the tongue) is carried by neurons from which ganglion?Axons from these cells synapse where?

A

inferior ganglion; superior part of the solitary nucleus

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18
Q

Cells carrying visceral afferent info from the carotid sinus and carotid body synapse where?

A

in the lower part of the solitary nucleus

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19
Q

What nucleus contributes lower motor neurons to CN IX? What other cranial nerves does this nucleus contribute to?

A

nucleus ambiguus; also contributes to X and XI

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20
Q

What muscle(s) is/are innervated by CN IX?

A

stylopharyngeus muscle

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21
Q

What kind of fibers does the inferior salivatory nucleus give rise to in CN IX? Where do these fibers synapse?

A

preganglionic parasympathetic; otic ganglion

22
Q

Postganglionic fibers arising fro the otic ganglion supply which structures?

A

parotid, buccal, and inferior labial glands

23
Q

Where is the apparent origin of the glossopharyngeal nerve?

A

superior, lateral aspec of the MO

24
Q

Where does CN IX exit the skull?

A

jugular foramen

25
Q

The jugular foramen has a septum which divides it into anterior and posterior compartments. Which compartment is the glossopharyngeal nerve found in?

A

posterior

26
Q

T/F: the superior ganglion is located just beyond the jugular foramen, outside of the cranium.

A

False; this is true of the inferior ganglion but the superior ganglion is located within the cranium

27
Q

Where does the tympanic nerve arise from?

A

the inferior ganglion

28
Q

What kind of fibers are carried by the tympanic nerve?

A

preganglionic parasympathetic fibers and somatosensory fibers

29
Q

What structure does the tympanic nerve travel through to get to the tympanic cavity?

A

tympanic canaliculus

30
Q

Where is the superior cervical ganglion?

A

superior part of the sympathetic trunk

31
Q

What kind of fibers does the tympanic nerve receive from the superior cervical ganglion?

A

postganglionic sympathetic fibers

32
Q

What is formed by the tmpanic nerve after it receives fibers from the superior cervical ganglion?

A

tympanic plexus

33
Q

What kind of info is carried by the tympanic plexus?

A

somatosensory

34
Q

Where does the tympanic plexus carry info from?

A

the tympanic cavity, pharyngotympanic tube, and the mastoid air cells

35
Q

After passing through the tympanic plexus, the preganglionic parasympathetic fibers carried by the tympanic nerve reform a what nerve?

A

the lesser petrosal nerve

36
Q

What is the basic course of the lesser petrosal nerve?

A

travels from its formation by the tympanic plexus trhought the lesser petrosal canal to the otic ganglion

37
Q

Besides for CN IX, what other CN carries postganglionic parasypathetic fibers from the otic ganglion?

A

CN V3 (to the parotid, buccal and inferior labial glands)

38
Q

What are the 5 types of fibers carried by CN IX?

A

parasympathetic, branchial motor, special sensory, visceral sensory, and general sensory

39
Q

What nerve ascends from below and enters CN IX at the inferior ganglion?

A

carotid branch

40
Q

What nerve carries info from chemoreceptors and baroreceptors to CN IX?

A

carotid branch

41
Q

What kind of receptors are in the carotid body? in the carotid sinus?

A

chemoreceptors; baroreceptors

42
Q

What other CN carries afferent info from the carotid sinus and body?

A

CN X

43
Q

Which branches convey sensory info from the mucosa of the pharynx?

A

pharyngeal branches

44
Q

What is formed by the combination of the pharyngeal brancheswith branches from the vagus nerve? this structure is near which plexus?

A

pharyngeal plexus; middle pharyngeal plexus

45
Q

What does the muscular branch of CN IX supply?

A

stylopharyngeus

46
Q

T/F: the stylopharyngeus is the only muscle supplied by the glossopharyngeal nerve.

A

True

47
Q

What is the action of the stylopharyngeus?

A

elevates the larynx and pharynx. also dilates pharynx

48
Q

What branches of CN IX supply the oral cavity?

A

tonsillar branches and lingual branches

49
Q

What is supplied by the tonsillar branches of CN IX?

A

sensory infor from the palatine tonsils and oral mucosa

50
Q

What is carried by the lingual branches of CN IX?

A

general sensory and taste info from the tongue posterior to sulcus terminalis

51
Q

How is the glossopharyngeal nerve tested?

A

gag reflex

PNS (43 decks)

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