CN IX

Question 1

What is the name for CN IX?

Answer 1

Glossopharyngeal (Go to Vegas)

Question 2

What kind of fibers are carried by CN IX?

Answer 2

motor, sensory, and autonomic fibers

Question 3

What muscle does CN IX send motor fibers to?

Answer 3

stylopharyngeus

Question 4

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

Answer 4

sensory, including taste info from the posterior tongue

Question 5

Where does CN IX send (ultimately) parasympathetic info?

Answer 5

parotid gland

Question 6

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

Answer 6

nucleus ambiguus

Question 7

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

Answer 7

Branchiomotor fibers

Question 8

Where do branchiomotor fibers develop from embryologically?

Answer 8

pharyngeal arches or branchial fibers NOT somites

Question 9

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

Answer 9

Inferior Salivatory Nucleus

Question 10

Where do afferent sensory fibers of CN IX terminate?

Answer 10

solitary nucleus

Question 11

What other CN is associated with the solitary nucleus?

Answer 11

CN VII

Question 12

What two peripheral ganglia are associated with CN IX?

Answer 12

superior and inferior ganglion

Question 13

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

Answer 13

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

Question 14

Where all is general sensory carried from in CN IX?

Answer 14

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

Question 15

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

Answer 15

tympanic cavity

Question 16

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

Answer 16

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

Question 17

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?

Answer 17

inferior ganglion; superior part of the solitary nucleus

Question 18

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

Answer 18

in the lower part of the solitary nucleus

Question 19

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

Answer 19

nucleus ambiguus; also contributes to X and XI

Question 20

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

Answer 20

stylopharyngeus muscle

Question 21

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

Answer 21

preganglionic parasympathetic; otic ganglion

Question 22

Postganglionic fibers arising fro the otic ganglion supply which structures?

Answer 22

parotid, buccal, and inferior labial glands

Question 23

Where is the apparent origin of the glossopharyngeal nerve?

Answer 23

superior, lateral aspec of the MO

Question 24

Where does CN IX exit the skull?

Answer 24

jugular foramen

Question 25

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

Answer 25

posterior

Question 26

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

Answer 26

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

Question 27

Where does the tympanic nerve arise from?

Answer 27

the inferior ganglion

Question 28

What kind of fibers are carried by the tympanic nerve?

Answer 28

preganglionic parasympathetic fibers and somatosensory fibers

Question 29

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

Answer 29

tympanic canaliculus

Question 30

Where is the superior cervical ganglion?

Answer 30

superior part of the sympathetic trunk

Question 31

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

Answer 31

postganglionic sympathetic fibers

Question 32

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

Answer 32

tympanic plexus

Question 33

What kind of info is carried by the tympanic plexus?

Answer 33

somatosensory

Question 34

Where does the tympanic plexus carry info from?

Answer 34

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

Question 35

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

Answer 35

the lesser petrosal nerve

Question 36

What is the basic course of the lesser petrosal nerve?

Answer 36

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

Question 37

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

Answer 37

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

Question 38

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

Answer 38

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

Question 39

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

Answer 39

carotid branch

Question 40

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

Answer 40

carotid branch

Question 41

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

Answer 41

chemoreceptors; baroreceptors

Question 42

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

Answer 42

CN X

Question 43

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

Answer 43

pharyngeal branches

Question 44

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

Answer 44

pharyngeal plexus; middle pharyngeal plexus

Question 45

What does the muscular branch of CN IX supply?

Answer 45

stylopharyngeus

Question 46

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

Answer 46

True

Question 47

What is the action of the stylopharyngeus?

Answer 47

elevates the larynx and pharynx. also dilates pharynx

Question 48

What branches of CN IX supply the oral cavity?

Answer 48

tonsillar branches and lingual branches

Question 49

What is supplied by the tonsillar branches of CN IX?

Answer 49

sensory infor from the palatine tonsils and oral mucosa

Question 50

What is carried by the lingual branches of CN IX?

Answer 50

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

Question 51

How is the glossopharyngeal nerve tested?

Answer 51

gag reflex