Test 2: Lecture 17 Auditory Flashcards

1
Q

higher air pressure creates ___

A

condensation

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2
Q

lower air pressure creates ___

A

rarefaction

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3
Q

change is pitch changes ___

A

frequency

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4
Q

change in loudness changes

A

the amplitude (magnitude of the wave)

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5
Q

the peak to peak variation in pressure gives impression of ___

A

loudness

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6
Q

the frequency of the sinusoidal pressure wave will change the ___

A

pitch

cycles per sec = Hertz

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7
Q

sound is measured in

A

dB (decibels)

Bel is one log unit

measurement relative to 20 microPascals

0 dB is threshold for humans at 1-4 kHz

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8
Q

complex sound leads to the ___

A

combination of all sound waves into a sum sine wave that can be understood by the brain

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9
Q

auditory transduction

A

sound waves into electrical signals that can be interpreted by the brain

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10
Q

bones of the inner ear

A

auditory ossicles

malleus, incus and stapes

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11
Q

___ hold the inner ear bones in place

A

anterior malleal ligament

posterior incudal ligament

tendon of the tensor tympani muscle

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12
Q

footplate of the stapes sends vibrations into the ___

A

oval window of the bony labyrinth

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13
Q

bony labyrinth is filled with a fluid called ___

A

perilymph

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14
Q

flexibility of the ___ allows vibrations of the stapes to move the perilymph

A

round window

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15
Q

corridor to the round window is found in the spiral portion called the ___

A

cochlea

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16
Q

vibrations ascending to the apex of the cochlea by the

A

scala vestibuli

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17
Q

vibrations descending from the apex of the cochlea to the round window by the

A

scala tympani

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18
Q

___ is in between the scala vestibuli and the scala tympani

A

cochlear duct

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19
Q

cochlear duct is filled with

20
Q

membrane on top of the cochlear duct

A

reissners membrane

21
Q

membrane below the cochlear duct

A

basilar membrane

22
Q

___ is found on the basilar membrane of the cochlear duct

A

organ of corti

23
Q

nerve impulses from the organ of corti to the brain are via the ___nerve

24
Q

hair cells within the organ of corti are covered by ___

A

tectorial membrane

25
lower frequencies vibrate the basilar membrane closer to the ___ of the cochlea
apex
26
higher frequencies vibrate the basilar membrane closer to the ___ of the cochlea
base
27
parts of the labyrinth
**Bony** • series of channels in bone • envelops membranous labyrinth **Membranous** • soft tissue contain sensory cells for hearing and balance • dorsal is vestibular – semi-circular canals, utricle, and sacculus • ventral is auditory – cochlea
28
movement of sound through the cochlea?
in through **footplate of the stapes** up the **scala vestibuli** down the **scala tympani** and out of the **round window**
29
another name for cochlear duct
scala media filled with endolymph
30
what part of the cochlear is filled with endolymph and with perilymph?
endolymph → scale media (cochlear duct) perilymph → scala vestibuli and scala tympani
31
apical surface sensory cells of the organ of corti are bathes in intracellular like \_\_\_
ionic environment → high K and low Na
32
there are ___ row of outer hair cells, and ___ row of inner hair cells in the organ of corti
3 1
33
hair cell are ___ cells
mechano-sensory
34
the afferent and efferent cells of the organ or corti are
afferent → inner efferent → outer
35
hair cells
found in the organ of corti ## Footnote characteristic sensory hairs or **stereocilia** on apical surface » typical organized in 3 rows of descending height communicate with **overlying tectorial membrane**
36
\_\_\_ are essential to the transduction of sound
tip links on the stereocilla will bind together the stereocilia of the hair bundle
37
deflection of hairs toward the tallest hair
depolarization
38
deflection of hairs away from the tallest hairs
hyperpolarization
39
asymmetric process excitatory
inhibitory
40
transduction channels are found near the tip of the ___ and are ___ channels
sterocilia non-specific cationic channels
41
afferent fiber to the brain are made of \_\_
inner hair cells contracted by ∼10 contract about 3 outer hair cells specialized synapses to allow high and prolonged rates of synaptic transmission
42
outer hair cells
Both sensory and motor elements • OHC are motile! – contraction and elongation • induced by voltage changes or inhibitory NT release – modifies cochlear mechanics – serves to sharpen cochlear frequency selectivity – “cochlear amplifier”
43
loss of hearing is caused by \_\_\_
**damage to hair cells** ## Footnote typical cause of sensorineural hearing loss – drug insults (aminoglycosides) – viral infection – degeneration of genetic origin – acoustic overstimulation » break tip links or disrupt actin core - ineffective transduction » hair cell death - excito-toxicity
44
acoustic overstimulation such as sat a concert will lead to \_\_\_
breaking tip links or disrupt actin core → can't transduce wound will eventually reform
45
middle ear muscles
tensor tympani stapedius
46
\_\_\_ collect and focus sound to the tympanic membrane
outer ear