Term
| The VIIIth Cranial Nerve is AKA... |
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Definition
| The Vestibulocochlear Nerve |
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Term
| What are the two portions of the VIIIth Cranial Nerve? |
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Definition
| The Cochlear Portion and the Vestibular Portion |
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Term
| The cochlear portion of the VIIIth Cranial Nerve comes from... |
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Definition
| the sensory cells of the cochlea. |
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Term
| The vestibular portion of the VIIIth Cranial Nerve comes from... |
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Definition
| The sensory cells of the vestibular system. |
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Term
| Which portion of the VIIth cochlear nerve travels as the Spiral Ganglion cells from the Organ of Corti to the modiolus? |
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Definition
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Term
| The cochlear portion of the VIIIth Cranial Nerve travels... |
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Definition
| as the spiral ganglion cells from the Organ of Corti to the modiolus joining the vestibular portion as it enters the IAM. |
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Term
| Which portion of the VIIIth Cranial Nerve travels from the sensory cells of all vestibular organs (Ampulla and Macula) |
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Definition
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Term
| Where do the Cochlear and Vestibular portions of he VIIIth Nerve meet? |
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Definition
| At the entrance of the Internal Auditory Meatus (IAM). |
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Term
| The Vestibular portion is also known as... |
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Definition
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Term
| The vestibular portion of the VIIIth nerve travels... |
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Definition
| from the sensory cells of all vestibular organs (Ampulla and Macula), and joins the cochlear portion of the VIIIth nerve and enters the Internal Auditory Meatus. |
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Term
| Which other nerve also travels with the VIIIth cranial nerve in the IAM? |
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Definition
| The Facial Nerve (VIIth Cranial Nerve) |
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Term
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Definition
| Auditory fibers spiral through the internal auditory meatus. It is a cable or bundle of fibers in which the basal or high frequency fibers are found on the outside of the bundle, and the low frequency or apical fibers are found on the inside of the bundle |
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Term
| Approximately how long is the internal auditory meatus in adults? |
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Definition
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Term
| Through what does the VIIth nerve spiral travel? |
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Definition
| The Internal Auditory Meatus |
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Term
| Aside from the VIII auditry nerve spiral what else does the IAM carry? |
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Definition
| The Internal Auditory Artery |
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Term
| The VIIIth nerve extends 17 to 19mm beyond the internal auditory canal, where it attaches to... |
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Definition
| the brainstem at a juncture of the cerebellum, medulla oblongata and the pons called the CEREBELLOPONTINE ANGLE |
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Term
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Definition
| on the brainstem, a juncture of the cerebellum the medulla oblongata and the pons where the VIII Nerve attaches. |
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Term
The nerve fibers that innervate the Outer
Hair Cells and Inner Hair Cells of the Organ of
Corti are both... |
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Definition
Afferent (sensory) and Efferent
(motor) |
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Term
| The function of Afferent (sensory) Fibers? |
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Definition
| to take sensory information from the periphery into the CNS |
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Term
| The function of efferent auditory nerve fibers is to... |
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Definition
| provide motor innervation from the CNS out to the periphery |
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Term
| What do we mean when we say that Afferent auditory verve fibers are bipolar? |
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Definition
they have a peripheral and a central
axon |
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Term
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Definition
| An axon or nerve fiber is a long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body or soma. |
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Term
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Definition
| the branched projections of a neuron that act to conduct the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project |
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Term
| The more peripheral axon of a bipolar auditory fiber can also be called? |
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Definition
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Term
| Unlike dendrites both peripheral and central axons are... |
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Definition
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Term
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Definition
action
potentials, which move across the cell body,
and continue to propagate along the central
axon |
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Term
| How many types of afferent bipolar spiral ganglion cells are there? |
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Definition
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Term
| Type I account for what percentage of the spiral ganglion cells? |
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Definition
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Term
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Definition
| account for 90% of the spiral ganglion cells. They are large, myelinated, and primarily attach to the IHCs; central axon attaches to the cochlear nucleus. |
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Term
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Definition
| a conical shaped central axis in the cochlea. The Modiolus consists of spongy bone and the cochlea turns approximately 2.75 times around the modiolus The spiral ganglion is situated inside the bony modiolus. |
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Term
| The spiral ganglion is situated inside the |
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Definition
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Term
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Definition
he group of nerve cells that serve the sense of hearing by sending a representation of sound from the cochlea to the brain.
ound in the spiral ganglion are strung along the bony core of the cochlea, and send projections into the central nervous system (CNS). |
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Term
| The internal auditory canal begins at the____ and ends at the _____ |
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Definition
cochlear modiolus
base of the brain |
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Term
| Type II neurons account for what percentage of the spiral ganglion cells/ |
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Definition
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Term
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Definition
| are small, unmyelinated, and connect to OHCs; central axon attaches to cochlear nucleus. |
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Term
| The majority of the nerve fibers of the VIII nerve are what type of fibers/ |
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Definition
| Afferent/Sensory aprox. 30,000 |
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Term
| There are aprox how many efferent (motor) cochlear fibers that travel primarily from the brainstem to the OHC's |
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Definition
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Term
| Afferent fibers enter the cochlea through... |
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Definition
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Term
| Type I Fibers synapse on each IHC in what type of pattern? |
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Definition
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Term
| Type II fibers cross the tunnel of corti to the OHC's in what type of pattern |
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Definition
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Term
| The cell bodies of efferent fibers are located in the brainstem primarily at... |
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Definition
| the level of the contralateral superior olivary complex. |
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Term
| The efferent fibers travel as a group called the |
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Definition
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Term
| Efferent fibers connect primarily to which type of hair cell? |
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Definition
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Term
| For IHC's the efferent fibers primarily contact the... |
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Definition
| afferent fiber dendrites, not he IHC's directly. |
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Term
| For OHC's efferent and afferent fibers both contact... |
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Definition
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Term
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Definition
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