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Glossopharyngeal Nerve and Middle Ear
Cole 6/27/11 lecture 1 hr
48
Anatomy
Undergraduate 4
06/06/2011

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Term
1) somatic sensory
2) somatic motor
3) parasympathetics
4) special sensory
5) visceral afferent

(ALL)
Definition
what are the modalities of the glossopharyngeal nerve?
Term
1) middle ear
2) INNER TYMPANIC MEMBRANE
3) auditory tube (eustachian)
4) pharynx
5) posterior 1/3 of tongue mucosa
6) mucosa over palatine tonsil (3rd arch)
Definition
what does CN IX provide somatic sensory innervation to?
Term
stylopharyngeus ONLY (3rd branchial arch)
Definition
what does CN IX provide somatic motor innervation to?
Term
PAROTID GLAND (makes the gland work)
Definition
what does CN IX provide parasympathetic innervation to?
Term
taste to posterior 1/3 of tongue
Definition
what does CN IX provide special sensory innervation to?
Term
baroception in the carotid sinus
checmoreception on the carotid body
Definition
what does CN IX provide visceral afferent innervation to?
Term
inferior glossopharyngeal ganglia holds the cell bodies of
1) somatic sensory
2) special sensory
3) visceral afferents
Definition
where are the somatic sensory cell bodies of the glossopharyngeal nerve? what else is found here?
Term
tympanic nerce
Definition
this branch of the glossopharyngeal nerve provides somatic sensation to the middle ear mucosa, mastoid air cells, and the inner surface of the tympanic membrane after splitting up in the tympanic plexus
Term
tympanic nerve, goes back into the skull via the tympanic canniliculus
Definition
name the first branch of the glossopharyngeal nerve, how does it get to its target?
Term
lingual branch
Definition
this branch of the hypoglossal nerve provides somatic sensory to the posterior 1/3 of the tongue and tonsil (among other things)
Term
the "sensory part" of the pharyngeal plexus
Definition
this branch of the hypoglossal n provides somatic sensory to the pharynx
Term
the inferior one
Definition
which glossopharyngeal ganglia is larger?
Term
jugular foramen
Definition
what foramen does CN IX pop out the skull?
Term
intense, shooting pain felt over the somatic sensory distribution of CN IX, it usually begins in the palatine tonsil or back of the pharynx and radiates to the ear
Definition
how does glossopharyngeal neuralgia present(give symptoms)?
Term
swallowing, chewing, or protruding the tongue

cause: possibly compression of the nerve as it is crossed by vessels near its origin
Definition
what illicits the pain in glossopharyngeal neuralgia? what is the suspected cause?
Term
they put teflon felt between the vessel and the nerve
Definition
how is glossopharyngeal neuralgia treated?
Term
nerve to stylopharyngeus
Definition
name the motor branch of the glossopharyngeal nerve
Term
lingual branch
Definition
name the branch of CN IX that provides the special sense of taste (among other things)
Term
1)somatic sensory to middle ear/tympanic membrane
2) parasympathetics to parotid gland
Definition
what information is carried by the tympanic nerve as it travels through the tympanic canniliculus?
Term
this is some wonky shit
1) CN IX out the jugular foramen
2) tympanic n. through tympanic canniliculus
3) tympanic plexus
4) lesser superficial petrosal nerve
5) through the foramen ovale
6) to the otic ganglion (SYNAPSE)
7) hops on V3 auriculotemporal nerve
Definition
describe the path or parasympathetics to the parotid gland
Term
auriculotemporal nerve (V3) carries them after they hitch a ride from the otic ganglion

note: this nerve is also carrying somatic sensory to the parotid gland
Definition
what nerve carries post-ganglioninc parasympathetics to the parotid gland?
Term
greater: CN 7 parasympathetics to lacrimal gland and nasal/oral mucosa

lesser: parasympathetics to parotid gland

deep: sympathetics from the IC plexus that hop over to the nerve to the pterygoid canal with CN 7 greater petrosal
Definition
what do the greater and lesser superficial petrosal nerves do? the deep petrosal?
Term
V3 (mandibular branch)
Definition
what else goes through the foramen ovale with the lesser superficial petrosal nerve?
Term
the otic ganglion
Definition
what lies just below the foramen ovale deep to V3?
Term
visceral afferents

carotid sinus: stretch receptors to sense BP (baroreception)

carotid body: chemoreceptors to sense CO2 levels in the blood
Definition
what information is carried by the nerve to the carotid sinus and the carotid body?
Term
1) the carotid Body is in the Bifurcation (B & B)
2) the carotid Sinus is in the Swelling (S & S)
Definition
what is in the bifurcation of the carotid artery? what is in the dilated part of internal carotid right after the bifurcation?
Term
petrous temporal bone
Definition
what bone are the middle and inner ear located in?
Term
the mastoid air cells
Definition
this is continous with the middle ear & eustachian tube, innervated by CN 9 for somatic sensation, acts as a site of muscle attachment, and has holes lined with mucosa that may help to lighten the temporal bone, what is it?
Term
lesser is more lateral, it's going to the parotid which is more lateral than the lacrimal gland(greater superficial petrosal)
Definition
which is more lateral? lesser superficial petrosal nerve or greater superficial petrosal nerve?

hint: what do they innervate?
Term
they go in the same named hiatus (hiatus of the greater/lesser superficial petrosal nerve)
Definition
how do the greater and lesser petrosal nerves go through the temporal bone?
Term
CN 7 and 8
Definition
what 2 nerves travel in the internal acoustic meatus?
Term
V3, nerve to tensor tympani
Definition
what innervates the tensor tympani muscle?
Term
the connection between the middle ear and the mastoid air cells
Definition
what is the mastoid aditus?
Term
1) ossicles
2) lateral surface of the tympanic memrane
3) mastoid aditus
4) lesser superficial petrosal n
5) facial nerve in the facial canal & exiting the stylomastoid foramen
6) tympanic plexus on the promontory
7) tympanic n (IX)
8) stapedius (& its nerve)
9) tensor tympani
10) chorda tympani
11) oval window
12) round window
Definition
what are the components of the middle ear?
Term
1) facial nerve in the facial canal
2) chorda tympani
Definition
what 2 nerves pass through the middle ear without innervating anything?
Term
posterior
Definition
what surface of the middle ear is the mastoid aditus located on?
Term
it passes superior to the handle of the malleus and superior/posterior to tensor tympani
Definition
describe the course of the chorda tympani through the middle ear
Term
inner surface: CN IX
outer surface: CN V, VII, X
Definition
describe the innervation of the tympanic membrane?
Term
synovial
Definition
what type of joints are formed between the ossicles?
Term
a ligament that attaches to the lateral process
Definition
what holds the malleus in place?
Term
the handle
Definition
what part of the malleus attaches to the tympanic membrane?
Term
the incus
Definition
what bone does the malleus articulate with?
Term
the long limb
Definition
what limb of the incus articulates with the stapes?
Term
base: over the oval window
head: articulates with the long limb of the incus
Definition
what does the base of the stapes rest against? the head?
Term
the carotid canal with the internal carotid plexus
Definition
what lies just medial to the middle ear?
Term
the optic chiasm (directly inferior is the eustachain (pharyngotympanic) tube
Definition
just lateral to the sphenoid sinus is the internal carotid artery and what nerve?
Term
the semicanal of the tensor tympani
Definition
what nerve canal lies just superior to the eustachian tube and the internal carotid artery?
Term
it increases the pressure of sound waves 17 fold, but applies it over a smaller distance
Definition
what does the ossicular chain do?
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