ears

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outer ear contains
- pinna &
- ear canal &
- ear drum
pinna

visible part of ear
earcanal
sound waves travel through this
ear drum

tympanic membrane
middle ear has
- ossicles
- hammer
- anvil
- stirrup
inner ear has
- cochlea which is where transduction occurs
- & semi-circular canals
where is sound made into neural impulses

cochlea
semi circular canals contain

vestibular system
to hear we must

detect changes of air pressure in eardrum
what creates sound waves

alternating regions of high and low pressure in the air
frequency

waves/seconds
pitch
- related to frequency
- pitch is what our brain percieves
amplitude

height, intensity, & amount of energy in wave
waveform

determines timbre of sound we percive
how are sounds transmitted

eardrum vibratons passed through middle ear bones then to cochlea
basilar membrane

sepertes chambers
hair cells

converts sound waves into neural impulses
after vibrations hit thew cochlea then

oval window moves in & out causeing pressure in outer chamber to change quickly
after the oval window it causes

ripples in the basilar membrane
after bailar membrane

the hair cells bend causing neural impulses
neural impulses are picked up by the

auditory nerve
after the auditory nerve impulses ar etaken to

thalamus
after thalamus then the

auditory cortex
place theory

we sense pitch bc hair cells move in different places in the cochlea
frequency theory

we snense pitch becaus ehair ce;s fore at different rates in the cochlea
conduction deafness

problem with system of condution the sound
nerve deafness

hair celld in cochlea are damaged usually by loud noise

Author

kimkrak

312280

Card Set

ears

Description

test 4

Updated

2015-11-30T21:18:24Z

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