Flashcards in Auditory & Vestibular Deck (49)
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1
what is hearing
neural perception of sound energy
2
what is sound
audible disturbance of molecules in a medium (air/water)
3
what kind of wave - sound
longitudinal
4
what is frequency and amplitude
frequency - pitch (low = low)
amplitude - volume (high/low pressure)
5
what is unit sound
decibel (dB)
6
what is audible range
~20Hz to 20kHz
7
what si the external ear for
air
collection
8
what si the middle ear for
bone
conc
9
what is the inner ear for
fluid
detection
10
what does the middle ear transmit
vibrations via ossicles to inner ear - mechanical concentrator and transmitter
11
what does inner ear transmit
cochlea traduces vibrations to electrical impulse
12
what are the layers of tymp mem
skin
CT
resp epi
13
name parts of ear
external ear
EAM
tymp mem
middle ear
middle ear ossicles
inner ear
IAM
cochlea
nasopharyngeal tube
14
what are the ossicles
tiny bones
malleus
incus
stapes
15
what are the ossicle joints
synovial joints
16
what si the conc of sound energy
big mem of tymp mem goes to small space meaning intensity and conc increase
not amplify
17
what fluid fills outer channels
perilymph
18
what fluid fills inner channels
endolymph
19
what is perilymph
essentially extracellular fluid - Na ions
20
what does fluid in ear system allow
conducting nerve AP's
21
what is the helocotremA
where two outer tubules meet at ape of cochlea
22
what are the three tubes of cochlea
scala vestiboli
scala tympani
scala media (middle)
23
what si the purpose of round window
transmit pressure in closed tube and dissipates it
deformable
24
what is the central part of cochlea
modulus bone
25
what are the hair cells in the ear
single row inner hairs used for hearing
outer hairs few used for sound location
26
what is the collection of hair cells called
organ of corti
27
what is stria vascular
sp epi on lateral wall of media producing endolymph
28
what is tonotopicity
cochlear organised in terms of high and low tones
high tones incase cochlea whilst low tones at helicotrema
29
what is the route for CN 8
sup olivary nun
trapezoid body
lateral lemniscus
medial lemniscus
inf colliculus
medial geniculate body
auditory radiation
30
