Unit 4 Flashcards
Name the TWO nerves which make up the Vestibulocochlear nerve
-Vestibular N
&
-Cochlear N
Where does the VESTIBULAR (branch of Vestibulocochlear) nerve terminate?
Vestibular Nuclear Complex
What 4 parts does the VESTIBULAR NUCLEAR COMPLEX contain?
- Superior Nucleus
- Medial Nucleus
- Lateral Nucleus
- Inferior Nucleus
Which PART of the Vestibular Nuclear Complex receives the majority of sensory fibers from the Vestibular Nerve?
Medial Nucleus!
Name the eponym for the MEDIAL NUCLEUS part of the Vestibular Nuclear Complex…
Shwalbe Nucleus
Where are CELL BODIES from the vestibular nerve located?
Vestibular Ganglion
The Vestibular Ganglion has 2 parts.
T/F
TRUE.
Name the 2 parts of the vestibular ganglion.
- Superior Part
- Inferior Part
Name the 3 INNER EAR STRUCTURES to which the peripheral processes extend to.
- saccule
- utricle
- semicircular canals
Where do CENTRAL PROCESSES from the VESTIBULAR GANGLION convey information to?
Vestibular Nuclei
MOSTLY the Medial Nucleus, aka shwalbe’ s nucleus
Where are the Vestibular Nuclei located???
Medulla Oblongota (Specifically, Floor of the RHOMBOID FOSSA w/in the M.O.)
Although MOST fibers terminate in the medial nucleus part of the vestibular nuclear complex, SOME may actually travel directly to the CEREBELLUM.
(T/F)
TRUE.
By way of ____________________ some fibers travel directly to the cerebellum
Inferior Cerebellar Peduncle
How many fibers does the vestibular branch of the Vestibulocochlear nerve carry?
20,000
How many fibers does the cochlear branch of the Vestibulocochlear nerve carry?
30-40,000
Which Branch of the Vestibulocochlear nerve traverses the internal acoustic meatus inferior to the facial nerve?
Cochlear Nerve
Which branch of CN VIII terminates into an anterior and a posterior nuclei?
Cochlear Nerve (Terminates into ant/post cochlear nuclei)
The cochlear nerve is made up of _______________.
Bipolar Neurons
The bipolar cell bodies of the cochlear nerve are found within the______________ of the cochlea.
Spiral Ganglion
The Vestibulocochlear N is composed of TWO nerves and is PURELY SENSORY.
(T/F)
TRUE
Cochlear DENDRITES extend from the spiral ganglion to the _______________
Spiral Organ
Organ of Corti
Another name for the Spiral Organ?
Organ of Corti
Cochlear AXONS carried in the Cochlear N will terminate in _________________
TWO cochlear nuclei
Name the 2 cochlear Nuclei
- anterior cochlear nucleus
- posterior cochlear nucleus
Both Cochlear nuclei are located in the Posterior, Superior Medulla Oblongota LATERAL to the ____________________.
Vestibular Nuclei
Name the 1st half of the Cochlear Pathway.
(Reminder: pathway is purely sensory)
Distal –> Proximal
- Bipolar Neuron Cell bodies @ Spiral Ganglion
- Dendrites extend to Spiral Organ
- Cochlear N carries axons to
- Termination @Ant./Post. Cochlear Nuclei
Name the 2nd half of the Cochlear Pathway.
After termination at cochlear nuclei, axons cross the brainstem and synapse in the TRAPEZOID NUCLEUS
-Said axons will form the LATERAL LEMNISCUS
The vestibular N. Divides into a superior and inferior branch. Of the two branches, which is smaller?
Inferior Branch (Approx 8,000 / 20,000)
Which two nerves compose the inferior branch?
- Saccular N
- Posterior Ampullary N.
Which nerve of the Inferior branch of the vestibular nerve will supply the Saccule?
Saccular Nerve
Which nerve of the inferior branch of the Vestibular Nerve will supply the Posterior Ampullary Crest?
Posterior Ampullary Nerve
Which of the Two branches of the Vestibular Nerve is larger, carrying about 12,000 of the 20,000 fibers?
Superior Branch
Which two nerves form the Superior Branch of the Vestibular Nerve?
- Anterior Ampullary N
- Lateral Ampullary N
What do the Lateral and Anterior Ampullary Nerves of the Superior Branch of the Vetsibular Nerve supply?
Lateral and Anterior Semicircular Canals
The utricle is supplied by 2 branches.
One branch stems from the ___________________ while the other branch is given off directly from the ___________________ of the Vestibular Nerve.
Lateral Ampullary Nerve
Superior Branch
The Superior Branch also sends a branch directly to the Saccule termed, _________’s nerve.
Voit’s
Name both terms given to a tumor involving the myelinating Schwan Cells
Acoustic Neuroma aka Vestibular Shwanoma
“Ringing in the ears”
Tinnitus
Tinnitus may also be the first sign of _________________
Meniere’s Disease
Cochlear Implants may be indicative of ________________________ hearing loss.
Sensorineuronal
Which Disease can be a differential diagnosis from Cervicogenic Vertigo and can also be tested with a swivel chair?
Vestibular Disease
The Glossopharyngeal N is a mixed cranial nerve carrying motor, sensory, and autonomic fibers.
(T/F)
TRUE.
