Exam 2 CN VIII Flashcards
Is the vestibulocochlear nerve sensory or motor?
It is purely sensory
T/F the vestibulocochlear nerve is made up of two nerves the vestibular nerve and the cochlear nerve
True
Where does the vestibular nerve terminate (non-specific)
In the vestibular nuclear complex
What parts make up the vestibular nuclear complex
Superior, medial, lateral, and inferior
Fibers carried in the vestibular nerve arise from cell bodies located where?
In the vestibular ganglion
What two parts make up the vestibular ganglion
Inferior and superior parts
Where does the cochlear nerve terminate
Terminates in two nuclei; anterior and posterior
What is the cochlear nerve composed of primarily
Composed of axons from spiral ganglion
What is the cochlear nerve made up of
Bipolar neurons
Where are the cell bodies located for the bipolar neurons of the cochlear nerve
Located in the spiral ganglion
What extends from the spiral ganglion to the spiral organ?
Peripheral processes (dendrites)
What is another name for the spiral organ
Organ of Corti
Axons from the cell bodies of the cochlear nerve are carried to where
They are carried to two cochlear nuclei, located in the posterior, superior M.O. , lateral to vestibular nuclei where they terminate
From the cochlear nuclei, axons cross to where and then synapse where?
The other side of the brainstem and synapse in the trapezoid nuclei
After axons from the cochlear nerve synapse in the trapezoid nuclei what do they then form
The axons form the lateral lemniscus
What 3 inner ear structures do the peripheral processes of the vestibular ganglion extend to
The saccule, utricle, and semicircular canals
What convey information to the vestibular nuclei and where are they from?
Central processes from the vestibular ganglion
Where is the vestibular nuclei located?
In the MO on the floor of the rhomboid fossa
Where do most vestibular nerve fibers terminate (specific)
In the medial vestibular nucleus or Schwalbe
Some vestibular fibers travel directly to the cerebellum by way of what
The inferior cerebellar peduncle
What way does information of the vestibulocochlear travel
Distal to proximal
What is the apparent origin of the vestibulocochlear nerve
The cerebellopontine angle
Where does the vestibulocochlear nerve travel within on its way to the internal acoustic meatus
Posterior cranial fossa where it enters along with the facial nerve
How many fibers does the cochlear nerve carry within the temporal bone
30-40,000
