Vestibulocochlear nerve Flashcards
where does the vestibular nerve terminate
vestibular nuclear complex (superior, medial, lateral, inferior)
what type of information is sent via the vestibulocochlear nerve
special senses (hearing and balance)
fibers carried in the vestibular nerve arise from cell bodies located where?
vestibular ganglion (inferior and superior parts; located in the internal acoustic meatus)
where does the cochlear nerve terminate?
in the anterior and posterior cochlear nuclei which is composed of axons from the spiral ganglion located within the cochlea
what is the cochlear nerve made up of
bipolar neurons whose cell bodies are in the spiral ganglion of the cochlea
peripheral processes extend from the spiral ganglion to
spiral organ (organ of corti)
cochlear nerve cell bodies terminate on the two cochlear nuchei which is located where?
posterior, superior medulla oblongata lateral to the vestibular nuchei
cochlear nuclei axons cross the brainstem and form the lateral leminscus where
the trapezoid nuclei
peripheral processes from the vestibular ganglion extends to what three inner ear structures?
the saccule, utricle, and the semicircular canals
central processes from the vestibular ganglion take information where?
the vestibular nuclei (located in the medulla oblongata in the floor of the rhomboid fossa)
where will most vestibular nerve fibers terminate?
medial vestibular nucleus
some vestibular fibers will travel to the cerebellum via what?
inferior cerebellar peduncle
apparent origin of the Vestibulocochlear nerve?
cerebellopontine angle
the nerve travels in the posterior cranial fossa to the internal acoustic meatus, which it enters along with the
facial nerve
the cochlear nerve carries
30-40,000 fibers
after the cochlear nerve leaves to temporal bone it goes where
the spiral ganglion of the cochlea
the vestibular nerve carries about 20,000 fibers and divides into what
the inferior branch(8000) and superior branch(12000)
the inferior branch is composed of two nerves what are they and what do they supply?
saccular nerve (saccule) and the posterior ampullary nerve (posterior ampulla crest)
the lateral and anterior semicircular canals are supplied by what
the lateral and anterior ampullary nerve which are branches of the superior branch of the vestibular nerve
what supplies the utricle?
a branch from the lateral ampullary nerve and a direct branch from the superior branch
the saccule is supplied by what
the saccular nerve from the inferior branch and a branch directly off the superior branch called Voit’s nerve
what is a tumor affecting CN VIII?
acoustic neuroma
ringing in the ears is called what
tinnitus
