Quiz CN 8&9 Flashcards
Is CN 8 motor or sensory? What two nerves make it up?
Purely sensory
Vestibular nerve and cochlear nerve
The vestibular nerve terminates in what complex? And how many parts consist of it?
Terminates in the vestibular nuclear complex
Consists of four parts
Superior, medial, lateral, and inferior
Fibers carried in the vestibular nerve arise from cell bodies located in the _________.
Vestibular ganglion
The vestibular ganglion has how many parts?
Two parts
Superior and inferior parts
The cochlear nerve terminates where?
Terminates in two cochlear nuclei: anterior and posterior
The cochlear nerve is composed of axons from the _______.
Spiral ganglion
The cochlear nerve is made up of what kind of neurons whose cell bodies are in the spiral ganglion?
Made up of bipolar neurons
Peripheral processes (dendrites) extend from the spiral ganglion to what organ?
Spiral organ (organ of Corti)
Axons from the spiral organ are carried in what nerve to terminate on what two nuclei? These two nuclei are located in what areas?
Carried in the cochlear nerve
Terminate on the two cochlear nuclei
Located in posterior, superior medulla oblongata, lateral to the vestibular nuclei
From the cochlear nuclei, how do axons cross and synapse?
The axons form what specific structure?
Cochlear nuclei axons cross to the other side of brain stem and synapse in trapezoid nuclei
Axons form the lateral lemniscus
What is another name for the trapezoid nuclei?
Superior olivary nucleus
Peripheral processes from the vestibular ganglion extend to what three structures?
Three inner ear structures;
Saccule, utricle, and semicircular canals
Central processes from the vestibular ganglion convey information to what nuclei? And where is this nuclei located?
Conveys information to the vestibular nuclei, located in the medulla oblongata on the floor the rhomboid fossa
Most vestibular nerve fibers will terminate where?
Terminate in the medial vestibular nucleus (Schwalbe)
Some fibers will travel directly to what brain structure through this structure?
Travel directly to the cerebellum by way of inferior cerebellum peduncle
What is the apparent origin for the course of the vestibulocochlear nerve?
Cerebellopontine angle
The vestibulocochlear nerve travels what path to enter along with the facial nerve?
Travels in the posterior cranial fossa to the internal acoustic meatus, which it enters along with the facial nerve
Within the temporal bone:
The cochlear nerve carries how many fibers?
30-40,000 fibers.
Within the temporal bone:
The cochlear nerve traverses the internal acoustic meatus in what position to the facial nerve?
Inferior to the facial nerve
After the cochlear nerve leaves the temporal bone it reaches what structure?
The spiral ganglion of the cochlea
The vestibular nerve carries how many fibers?
20,000 fibers
As the vestibular nerve approaches the ear, it divides into what two branches?
Superior and inferior branches
The smaller inferior branch of the vestibular nerve is composed of what two nerves?
The saccular nerve and posterior ampullary nerve
The saccular nerve and posterior ampullary nerve supply what?
Supply the saccule and the posterior ampullary crest, respectively
The larger superior branch of the vestibular nerve is formed by what two nerves?
The lateral and anterior ampullary nerves
The lateral and anterior ampullary nerves supply what?
Supply the lateral and anterior semicircular canals
How is the utricle supplied?
Supplied by a branch from the lateral ampullary nerve and a branch directly off of the superior branch
The superior branch of the vestibular nerve also sends a branch directly to the _____, which is called Voit’s nerve
Directly to the saccule
What is an acoustic neuroma?
A vestibular schwanoma
Tinnitus can be a 1st sign for what?
Meniere’s Disease
What is Meniere’s Disease
Tinnitus, vertigo, hearing loss
Cochlear implants help with what?
Sensory; neural hearing loss
Vestibular disease can be detected through different detections of what?
Cervicogenic vertigo
What kind of information does the glossopharyngeal nerve carry?
Motor, sensory, autonomic fibers
Mixed cranial nerve
The glossopharyngeal nerve for motor innervation carries it to what muscle?
Sensory information from what?
Taste information from what?
Parasympathetic information leading ultimately to where?
Motor innervation to stylopharyngeus muscle
Sensory information from the pharynx
Taste information from posterior tongue
Parasympathetic information to the parotid and other glands
Motor fibers carried in glossopharyngeal nerve arise from cell bodies located where?
Superior part of nucleus ambiguus
Preganglionic parasympathetic fibers arise from what in the glossopharyngeal nerve?
Arise from inferior salivary nucleus
Afferent, sensory fibers terminate where in the glossopharyngeal nerve?
Terminate in solitary nucleus
How many peripheral ganglia are associated with the glossopharyngeal nerve?
What are they?
Which one is smaller?
Two peripheral ganglia
Superior and inferior
Superior ganglion is smaller and is usually thought of as a separated part of the inferior ganglion
General sensory information is carried in the glossopharyngeal nerve branches form what parts?
From nasopharynx, oropharynx, and portion of the tongue posterior to the sulcus terminalis, uvula, and palatine tonsils
General sensation from this structure is also carried in a branch of the glossopharyngeal nerve
Tympanic cavity
The neurons for the tympanic cavity have cell bodies located in the _____. From there, information is conveyed to the CNS and fibers synapse in the ______ of this main nerve
Cell bodies located in the inferior ganglion
Fibers synapse in the spinal nucleus of the trigeminal nerve
Taste information from the tongue posterior the sulcus terminalis is carried by neurons from this structure
Inferior ganglion
Axons from the inferior ganglion for taste information synapse in what part of what nucleus
Superior part of the solitary nucleus
Some incoming fibers from what ganglion synapse in what part of the solitary nucleus?
Inferior ganglion
Lower part of the solitary nucleus
Those incoming fibers from the inferior ganglion carry what kind of information from the _____ and _____
Carry visceral afferent information from the carotid sinus and carotid body
The nucleus ambiguus contributes what kind of motor neurons to what three cranial nerves?
Lower motor neurons
Cranial nerves 9, 10, 11
Axons from lower motor neurons carried in CN 9 will innervate what muscle?
Stylopharyngeus muscle
The inferior salivary nucleus gives rise to what kind of axons carried in the glossopharyngeal nerve
Preganglionic parasympathetic axons
The preganglionic parasympathetic axons carried in the glossopharyngeal nerve will synapse in what ganglion, from which arise what postganglionic fibers that supply what three glands?
Synapse in the otic ganglion
Supply parotid, buccal, and inferior lablial glands
What is the apparent origin of the glossopharyngeal nerve?
Lateral aspect of superior medulla oblongata
The glossopharyngeal nerve exits the skull via the?
Jugular foramen
Where are the superior and inferior ganglion located?
Superior ganglion located inside the cranium
Inferior ganglion located, beyond the jugular foramen, outside the cranium
The tympanic nerve arises from what ganglion?
Inferior ganglion
The tympanic nerve carries what two types of information?
These fibers are carried through the ____ into the ______.
Preganglionic parasympathetic and sensory fibers
Fibers are carried through the tympanic canaliculus into the tympanic cavity
Once in the tympanic cavity, the tympanic nerve receives what kind of fibers from the superior cervical ganglion, and forms the _____
Receives postganglionic sympathetic fibers
Forms the tympanic plexus
The tympanic plexus carries this kind of information from what three structures?
Carries somatosensory information
From tympanic cavity, pharyngotympanic tube, and the mastoid air cells
The preganglionic parasympathetic fibers pass through the tympanic plexus and reform as the ______, which travels through the ____ to the ___ ganglion
Reform as lesser petrosal nerve
Travels through lesser petrosal canal
Otic ganglion
The carotid branch ascends from below and enters the nerve at the _______.
Inferior ganglion
The carotid branch ascends from below and enters the nerve at the _____. It carries ______ from chemoreceptors in the carotid body and baroreceptors in the _____.
Similar information may be carried in the _____ nerve
Inferior ganglion
Carries afferent information
In the carotid sinus
Vagus nerve
Pharyngeal branches convert _____ information from the _______. These branches will combine with some ______ branches to from the ________ plexus near the _________ plexus.
Sensory information Mucosa of the pharynx Vagal branches Pharyngeal plexus Middle pharyngeal plexus
The muscular branch leaves the _______ nerve to supply one muscle, the ______
Glossopharyngeal nerve
Stylopharyngeus
The remaining branches of the glossopharyngeal nerve reach the ______
Oral cavity
Tonsillar branches convey _____ information from the _____ and ______
Sensory information
Palatine tonsils
Oral mucosa
Lingual branches carry general ______ and _____ information from the ____, posterior to the ______
Sensory
Taste
Tongue
Sulcus terminalis
The preganglionic parasympathetic fibers from the _____ ganglion are carried in branches of CN ___ to these three glands
Otic ganglion
CN mandibular nerve trigeminal
Parotid, buccal, and inferior labial glands
