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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

why does nerve go to sup olivary nun

for localisation and space diff intensities