PNS Exam 2

What is the name of CN VIII?

Vestibulocochlear Nerve

CN VIII is (motor/sensory/mixed)

sensory

What nerves make up the CN VIII?

a vestibular and cochlear nerve

Where does the vestibular n part of CN VIII terminate?

vestibular nuclear complex

The vestibular nuclear complex is (unipolar, bipolar)?

bipolar

What are the parts of the vestibular nuclear complex?

superior, medial, lateral, inferior

The superior vestibular nuclear complex is also refered to as ?

Bechterew

The medial vestibular nuclear complex is also referred to as ?

Schwalbe

The lateral vestibular nuclear complex is also referred to as ?

Deiters nucleus

What is the origin of the vestibular nerve ?

cell bodies in vestibular ganglion

What are the parts of the vestibular gangion?

inferior and superior parts

What is the location of the vestibuar ganglion?

internal acoustic meatus

What is the point of termination for the cochlear nerve?

anterior and posterior cochlear nuclei

What is the cochlear nerve composed of axons from?

spiral ganglion

Where is the spiral ganglion located at?

within cochlea

What distance do the peripheral processes span?

spiral organ (of Corti)

Where are the cell bodies of the cochlear nerve?

spiral ganglion of cochlea

Where are the terminal cochlear nuclei located?

posterior superior medulla oblongata lateral to the vestibular nuclei

What happens to the fibers after leaving the cochlear nuclei?

cross to other side of brainstem and synapse in the trapexoid nuclei in which the axons form the lateral lemniscus

What nuclei is the trapezoid nuclei functionally the same as?

superior olivary nucleus

Where do the peripheral processes from the vestibular ganglion extend to?

3 inner ear structures: saccule, utricle, semicircular canals/ducts

Where do the central processes from the vestibular ganglion convey info to ?

vestibular nuclei

Where is the vestibular nuclei located?

medullar oblongata on the floor of the rhomboid fosssa

Where do the majority of the vestibular nerve fibers terminate?

medial vestibular nucleus aka Schwalbe

Where do a minority of fibers from the vestibular nerve terminate?

cerebellum by way of inferior cerebellar peduncle

What is the apparent origin of CN VIII?

cerebellopontine angle

Which 2 nerves enter the internal acoustic meatus?

CN VII and VIII

The cochlear nerve carries ? fibers than the vestibular nerve

more

The cochlear nerve is ? to the facial nerve in the internal acoustic meatus

inferior

What happens to the vestibular nerve when it approaches the ear?

divides into superior and inferior branches

Which branch is smaller in the vestibular nerve?

inferior branch

What nerves make up the inferior vestibular nerve?

saccular nerve and posterior amoullary nerve

What does the branches of the inferior vestibular nerves supply?

saccule and posterior ampullary crest

What make up the suprior branch of the vestibular nerve?

lateral and anterior ampullary nerves

What do the branches of the superior vestibular nerve supply?

lateral and anterior semicircular canals

What supplies the utricle?

branch from lateral ampullary nerve and a branch off the superior branch

What branch of the vestibular nerve sends a branch to the saccule? What is the name of this branch?>

superior branch; Voit's nerve

What is a tumor of the Vestibulocochlear nerve?

acoustic neuroma/ Vestibular Schwannoma

What is the term reffering to ringing in the ears?

tinnitus

What does tinnitus a symptom of ?

Meniere's disease resulting in vertigo

Who are candidates for cochlear implants?

people with sensory hearing loss

What is vertigo when saccule utricle and semicircular canals are stimulated?

Vestibular disease

How is vestibular disease different from cervicogenic vertigo?

cervicogenoic is coming from neck

The glossopharyngeal nerve carries ? fibers

motor, sensory, autonomic

What is the only muscle supplied by CN IX?

Stylopharyngeus muscle

Where does the glossopharyngeal nerve carry sensory information from?

pharynx

Where does CN IX carry taste info from?

posterior tongue

What type of info is carried via CN IX to the parotid and other glands?

parasympathetic

Where do the motor fibers of glossopharyngeal arise from?

superior part of nucleus ambinguinus

What information is carried from nucleus ambinguinus? from where?

motor to stylopharyngeus

Where do the preganglionic parasympathetic fibers arise from in the glossopharyngeal nerve?

inferior salivary nucleus

What nerve do the pregnanglionic parasympathetic nerve travel in?

tympanic

Where do the preganglionic parasympathetic nerves of the CN IX synapse in?

otic ganglion

Where do the aferent sensory fibers of CN IX terminate in?

solitary nucleus and spinal nucleus

What are the 2 peripheral ganglions associated with the glossopharyngeal nerve?

superior and inferior ganglion

What is another name for the inferior ganglion of CN IX?

petrosal ganglion

Which ganglion is larger in glossopharyngeal nerve?

inferior

Where is the general sensation information carried in the glossopharyngeal branches from?

nasopharynx, oropharynx, posterior tongue, uvula, palatine tonsils, tympanic cavity

What nerve carries information and apin from ear infections?

CN IX

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

inferior ganglion

Where does the sensory information of CN IX synapse in?

spinal nucleus of trigeminal

Where does taste information from the posterior tongue synapse in?

superior part of solitary nucleus

What do the cells carrying visceral afferent info from carotid sinus and carotid body carry info to via CN IX?

lower solitary nucleus from inferior ganglion

What does the nucleus ambinguus contribute LMN to?

CN IX X XI

What type of information does the inferior salviary nucleus give rise to?

pregang parasympathetic axons carried in glossopharyngeal n

The otic ganglion carries ? fibers that supply the parotid glands, buccal glands, and inferior labial glands from CN IX

postganglionic parasympathetic

What is the apparent origin of glossopharyngeal nerve>

rootlets from superior medulla oblongata

Where does the glossopharyngeal nerve exit the cranial vault?

jugular foramen

For CN IX, the superior ganglion is located ? craniym while the inferior ganglion is located ? cranium

insdiel outside

What type of info is carried in the tympanic nerve?

preganglionic parasympathetic as well as sensory

What is the path of the preganglionic parasympathetic fibers of tympanic nerve?

tympanic canaliculus into tympanic cavity

Where does the tympanic nerve recieve postganglionci sympathetic fibers from>

superior cervical ganglion

AFter leaving the superior cervical ganglion, the tympanic nerve forms ?

tympanic plexus

What type of info is carried via the tympanic plexus?

somatosensory info from tympanic cavity, pharyngotympanic tube, and mastoid air cells

The preganglionic parasympathetic fibers pass throug hthe tympanic plexus and form ? which travels to the ?

lesser petrosal nerve; otic ganglion

Where does the carotid branch of CN IX enter the nerve? what info?

ifnerior ganglion to chemoreceptors and baroreceptors

What is the only visceral sensory branch of CN IX?

carotid branch

Where does the info from the carotid branch for glossopharyngeus go to?

inferior solitary nucleus

What is the only general sensory branch of CN IX?

pharyngeal branches that form pharyngeal plexus

What does the pharyngeal branch of CN IX combine iwth in the pharyngeal plexus?

vagal branch

What branch of CN IX supplies palatine tonsils and oral mucosal?

tonsillar branches

What branch of CN IX carry general sensory and taste to tongue?

lignual branches

The taste info of CN IX is posterior to ?

sulcus terminalis

What type of taste info is carried in glossopharyngeal nerve?

bitter and sour

What nerve is difficulty swallowing associated with?

glossopharyngeal nerve

What test can be used to test for glossopharyngeal nerve>

gag reflex

The vagus nerve carries ? information

motor, parasympathetic, sesnory

What is the longest CN?

X

What is the most important parasympathetic nerve?

Vagus

Where are the cell bodies of the motor fibers for Vagus?

nucleus ambiguus

Where does the nucleus ambiguus recieve info from?

both hemispheres

Where do the preganglionic parasympathetic fibers of vagus arise from?

posterior/ dorsal nucleus of vagus

Where does the dorsal nucleus of vagus recieve information?

hypothalamaus and carotid sinus

Where does the somatic sensory information terminate for vagus?

spinal nucleus of CN V

Where does vagus taste and viscerosensory information terminate?

nucleus of solitary tract

What are CN X peripheral ganglia?

superior/ jugular and inferior/ noduse ganglia

What is the other name of Vagus superior ganglion?

jugular ganglion

What is the other name of Vagus inferior ganglion?

nodose ganglion

Which pathway of vagus has cell bodies located in the superior ganglion?

somatic sensory

What somatic sensory information is carried in vagus?

dura/infratentorial/posterior fossa; auricle; external auditory canal; lateral tympanic membrane; mucosa of oropharynx; laryngopharyx