unit 3: CN VIII, vestibulocochlear Flashcards
purely sensory CN, composed of the vestibular and cochlear nerves
vestibulocochlear nerve
nucleus of termination for the VESTIBULAR nerve, and its four parts
- vestibular complex
- superior, medial (most synapse here), lateral, inferior
the nuclei of termination (2) for the COCHLEAR nerve
anterior cochlear nuclei
posterior cochlear nuclei
vestibular nerve fibers arise from CB located in the _____ ____, which has inferior and superior parts
vestibular ganglion
cochlear nerve is made up of bipolar neruons whose CB are in the ___ ___ of the cochlea, where peripheral processes are received from the ___ ___
spiral ganglion spiral organ (of corti)
location of the 2 cochlear nuclei (of termination), lateral to the vestibular nuclei
posterior superior MO
from the cochlear nuclei, axons CROSS TO THE OTHER SIDE of the brainstem and synapse in the ____ ___, where axons form the _____ ____
trapezoid nuclei
lateral lemniscus
- PERIPHERAL processes from the vestibular ganglion extend to 3 inner ear structures ___ ___ & 3 ____ ___
- CENTRAL processes convey info to the vestibular nuclei, located in the ______ on the floor of the rhomboid fossa
saccule
utricle
semicircular ducts
MO
most vestibular nerve fibers terminate in the _____ vestibular nucleus and some fibers travel directly to the cerebellum via the ___ __ ___
medial
inferior cerebellar peduncle
information in the vestibulocochlear nerve travels from ____ to _____
distal
proximal
apparent origin of the vestibulocochlear nerve
cerebellopontine angle
vestibulocochlear nerve travels in the posterior cranial fossa to enter the ___ ___ ____ (along w/ the facial nerve, which runs inferiorly to it)
-course follows within the temporal bone
internal acoustic meatus
the COCHLEAR nerve carries ____ fibers and has no branches, while the VESTIBULAR carries about _____ fibers and splits into a superior and inferior branch
30-40,000
20,000
the inferior vestibular branch has about ___ fibers while the superior branch carries about ____
8000
12000
the inferior vestibular branch is composed of the ____ nerve, which supplies the saccule & the ___ ___ nerve, which supplies the posterior ampullary crest
saccular
posterior ampullary
the superior vestibular branch is formed by the ___ & ___ ___ nerves, which supply the lateral & anterior ___ ____
lateral & anterior ampullary
semicircular canals
the UTRICLE is supplied by a branch of the __ __ nerve as well as a branch directly off of the ___ ___ branch, which also sends a branch of its own to the SACCULE (voit’s nerve)
lateral ampullary
superior vestibular
Name for the branch that goes directly to saccule from superior branch (of vestibular n)
voit’s nerve
Schwalbe is term for ___ ___ nucleus
medial vestibular
