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II.2 II.2 (M Sept 21) (M Sept 21) Hearing with Ear and BrainHearing with Ear and Brain

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malleusmalleus

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semicircular channels semicircular channels cochleacochlea

ear drumear drum

auricleauricle

1 cm1 cm22

20-fold reinforcement20-fold reinforcement

enters the upper (oval) window of cochleaenters the upper (oval) window of cochlea

2.5 windings2.5 windings30 mm length30 mm length

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scalascalamediamedia

scalascalatympanitympani

scalascalavestibulivestibuli

auditory nerveauditory nerve

oval oval windowwindow

perilymphperilymphliquidliquid

endolymphendolymphliquidliquid

1010-8-8 cm in 1/200 sec cm in 1/200 sec 24‘000 hair cells24‘000 hair cells

30-50 stereo-30-50 stereo-andand1 kino-ciliae1 kino-ciliae

Corti organCorti organ

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nervus cochlearisnervus cochlearis

nucleus cochlearisnucleus cochlearis

nuclei superiores olivaenuclei superiores olivae

corpus geniculatum medialecorpus geniculatum mediale

colliculus inferiorcolliculus inferior

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cochleacochlea

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high pitchhigh pitch

cat braincat brain

multiple representation ofmultiple representation ofsame pitchsame pitch