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Inner Ear Cochlea 2
Audiology Exam 1
| Question | Answer |
|---|---|
| What does mechanical response of the inner ear really look like? | 3 curves within the envelope show the displacement of the basilar membrane at different places in the cochlea |
| Each curve in a mechanical response of the inner ear shows the displacement pattern at different points in __________ | Time |
| Envelope of the wave represents the _____________ that occurs at each point of time | Maximum displacement |
| Modiolus | The bony structure forming the central of the cochlear labyrinth |
| Osseus spiral lamina | A bony shelf that extrudes from the modiolus |
| Lateral wall | Forms the outside of the bony labyrinth |
| What do pillar cells do? | Provide structural support to the organ of corti |
| Where are the pillar cells located? | Between inner hair cells and outer hair cells |
| What is the space between the two rows of pilar cells know as? | The tunnel of the organ of corti |
| The tow of pillar cells closest to the _________ rests on top of the ___________ | Modiolus, osseus spiral lamina |
| The row of pillar cells closest to the lateral wall are only supported by? | The basilar membrane |
| Pillar head moves ________ when BM goes down-radial motion | Lateral |
| A hinge point is made during fluid vibrations due to the ___________ __________ of basilar membrane and resting location of _________ ________ | Radial displacement, pillar cells |
| Deflection towards tallest cilia is _________ | Excitatory |
| Displacement towards the tallest stereocilia causes maximum _____________ | Depolarization |
| Displacement othogonal to the tall-short axis has little effect on? | Membrane potential |
| Displacement towards the shortest stereocilia ___________ the cells | Hyperpolarizes |
| In basilar membrane movement, traveling wave is not symmetrical from __________ to ___________ | Base, apex |
| Greater movement towards base than ___________ | Apex |
| Low frequency sounds can interfere with what kind of sounds? | High frequency |
| _________________ don't interfere with low frequency sounds | High frequency sounds |
| Change in basilar membrane movement with increased signal amplitude results in _____________________ increasing | Height of displacement |
| The change in basilar membrane movement with increased signal amplitude results in traveling wave __________ and _________ towards the base | Broadening, expanding |
| One mechanisms of coding loudness? | Possible to a degree but not fully understood |
| What happens when two sounds are presented simultaneously? | Traveling waves can add together if frequencies are close enough together |
| If the frequencies are far enough apart, they can both occur without? | Major interaction |
| If frequencies are close together and amplitude of one sound is sufficiently higher than the other, what may occur? | Masking, one sound is covered up |
| Frequency selectivity | The ear is capable of parsing out different frequencies and that is largely due to outer hair cells |
| At the point of ______________ the tectorial membrane shears against outer hair cells stereocilia enough to activate their electromotive function (prestin) | Maximum displacement |
| After prestin is activated, there is greater activation of the inner hair cells in that particular ______________ region | Tonotopic |
| The result of prestin and the tonotopic region being activated is greatly increased activation in a select region that contributes to improved ______________- | Frequency selectivity |
| Traveling wave envelope gets _________ as cochlea deteriorates | Broader |
| A healthy inner ear has _________ basilar membrane tuning | Sharp (narrow) |
| Outer hair cells damaged result in loss of ___________________ | Frequency selectivity |
| Damaged inner ear, basilar membrane vibration ________ tuned | Broadly |
| The spiral ganglion neurons are the same as? | The auditory nerve |
| _______% of afferent nerve fibers receive input from inner hair cells | 95 |
| ____________ information is carried by fibers in the center of the nerve in tonotopic organization of the spiral ganglion neurons | Low frequencies |
| __________ are located on the outside of the nerve in tonotopic organization of the spiral ganglion neurons |
Created by:
RachelJClark
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