Flashcard Set Preview
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| 1 |
What happens to the basilar membrane when it is receiving the highest frequency stimulus?
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It is displaced or bent in a transverse or radial fashion as well as in a longitudinal fashion...
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| 2 |
The traveling waves alsways travels from the base to Apex?
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True the traveling wave alsways travels form the Base to the Apex of the Cochlea
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| 3 |
In most natural situations where the traveling waves are found the direction of the traveling...
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FALSE not so in the cochlea
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| 4 |
No matter where Bekesy placed the stapes into the cochlear pertition the wave ALWAYS TRAVELED...
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TRUE
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| 5 |
This theory by Bekesy has come to be known today as the
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Traveling Wave Paradox
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| 6 |
The Slope of the envelope is less from the point of maximum displacement to the base of the...
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FALSE
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| 7 |
The point of maximum displacment including the slope is at different points on the BM for different...
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LOWER FREQUENCIES Toward the APEX
HIGHER FREQUENCIES Toward the BASE
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| 8 |
What is more important the instantaneous maximum or the maximum point?
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It is not the instantaneous maximum that is of ultimate importance but the maximum point of...
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| 9 |
Due to the importance of the maximum point in the displacement of the envelope and NOT the...
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The neurological system uses & interprets to give character & definition to the incoming...
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| 10 |
The maximum point of deflaction in a wave is towards the Apex or the Base?
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the maximum point of deflaction is near the Apex
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| 11 |
Excitation of the OUTER HAIR CELLS
Shearing Action
Imagine a hair cell at rest and this...
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What are the two principles in the shearing action of an Outer Hair Cell?
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| 12 |
Shearing Action Principles in an Outer Hair Cell?
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#1 Changes in radii during compression and rarefraction
#2 Off set pivot points between the...
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| 13 |
The Excitation of the Hair Cells
When they are at rest?
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when they are at rest they are equal
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| 14 |
when they are deformed (the edges have been moved up?
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the radious is bent and this means it is a compression
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| 15 |
When the radious is bent on the opposite direction
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Then the radious is less at bottom bar than the top bar then it is a rarefraction
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| 16 |
When it is bent towards the Scala Tympani it turns into a
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Rarefraction
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| 17 |
When it is bent toward the Scala Vetibuli it turns into a
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Compression
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| 18 |
What happens to the hair cells sitting on top of the BM?
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The up and down motion or the compression and rarefraction of the radious is going to change...
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| 19 |
Electrical Potentials of the Inner Ear
What is Cochlear microphonic?
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Cochlear microphonic is an electrical responce to an acoustic stimulus and represents quite...
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| 20 |
Why is the AC an alternating elctrical response?
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The Cochlear microphone is an alternating electrical response (AC) because the waveform of...
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| 21 |
The cochlear microphone for low frequencies
can be measured along the entire BM?
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True the CM can be measured along the entire BM for low frequencies
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| 22 |
For high frequencies the CM can be measured?
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for high frequencies the CM can be measured only along the Basal end
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| 23 |
Low frequencies activate the entire Basilar membrane whereas high requencies activate only...
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True-Low frequencies activate the entire Basilar membrane whereas high requencies activate...
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| 24 |
The CM is probably due to what?
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The CM is due to Radial bending or shearing of the sterocilia of cochlear hair cells
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| 25 |
Does the CM appear to cease after the 8th nerve is damaged?
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The CM does not seem to cease upon severing of the 8th nerve hoever if the cochlear hairs are...
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| 26 |
Does it take more intensity to measure the summating potential SP or the the CM cohlear microphonic?...
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It takes about 20-30 dB more to measure the SP summating potential than it takes to measure...
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| 27 |
The Summating Potential is is due to what factors?
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The SP is due to longitudinal bending or shearing of primarly inner hair cells in the direction...
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| 28 |
What is resting potential?
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Resting Potential is the normal D/C charge of an area or structure under no stimulation conditions...
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| 29 |
There are 2 types of Resting Potential?
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Intracellular polarization and endolymphatic potential
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| 30 |
What is intracellular polarization/ potential
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Is a negative 80 millivolt electrical charge/ potential presnt in most body cells and tissues...
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| 31 |
what is endolymphatic potential or polarization?
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is a positive 80 millivolt charge/potentail which is unique of the Scala Media
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| 32 |
What is ACTION POTENTIAL?
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Action potential is the cochlear action potential usually considered at the discharge pattern...
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| 33 |
Does the AP obey the ALL or NONE LAW?
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The Action Potential or the AP obeys the all or none law in that nerve fibers either fire at...
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| 34 |
What do the 8th nerve fibers exhibit in terms of the all or none Law?
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The 8th nerve fibers also demonstrate absolute and relatively refractory periods
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| 35 |
When the single unit action potentials are measured the response from the nerve fiber is reffered...
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TRue whena sigle unit action potentials are measured the response is called a spike
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| 36 |
This spike occurs in regular or irregular patterns?
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This spike occurs in an irregular pattern
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| 37 |
FIRST ORDER NEURON
Name the parts?
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the first order has a cell body has dendrites protoactionsa nda an axonal extension a nerve...
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| 38 |
what do the 5 dots in a row (drawing of the first order neuron represent?
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These five dots represent a collection of nerve bodies called the SPIRAL GANGLION
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| 39 |
WHEN TALKING ABOUT THE CENTRAL FIBERS OF THE FIRST ORDER NEURON WE HAVE FIBERS WHERE?
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the fibers coming down from the Apex cochlea decend through the central part or core of the...
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| 40 |
What are Apical Fibers?
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Apical Fibers are the ones coming down through the apical end through central foramen they...
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| 41 |
What are Basal fibers?
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Basal Fibers are fibers that come down through the periphery end of the 8th nerve and through...
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| 42 |
The 8th nerve trunk is twisted like a piece of rope or cable true or false?
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True the 8th nerve trunk is twisted like a piece of rope or cable becasue the nerve develps...
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| 43 |
therfore beacuse the 8th nerve is developed during the embryonic stage the cochlea folows the...
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TRUE
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| 44 |
The OHC connect to both efferent and afferent and connect to the base?
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Yes they connect at the same place both
efferent and afferent
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| 45 |
The IHC the afferent connect to the efferent and not to the base?
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True the afferent connects to the efferent and not to the base
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| 46 |
What is the path of the Auditory track?
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The AT is from the hair cells to the cortex
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| 47 |
Afferent means? UP ARROW
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Afferent means moving away from
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| 48 |
Efferent means? DOWN ARROW
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Efferent means moving towards to
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| 49 |
All of the neurology associated w the central auditory system is not afferent (moving from...
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Look at the card again
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| 50 |
If you look just at the afferent hair cells whre does the greatest amount come from ?
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the greatest amount comes from the inner hair cells
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| 51 |
The Auditory track is?
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98% afferent and 2% efferent
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| 52 |
If you look at just the decending or efferent fibers?
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The % or 85-90 connect to the base of the outer hair cell fibers
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