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II.1 Physical Reality II.1.2 (Th Sept 05) Hearing with Ear and Brain

Delve into the remarkable journey of sounds through the ear and brain, from the malleus, incus, and stapes to the cochlea and auditory nerve, unraveling the complex mechanisms responsible for our sense of hearing.

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II.1 Physical Reality II.1.2 (Th Sept 05) Hearing with Ear and Brain

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  1. II.1 Physical Reality II.1.2 (Th Sept 05) Hearing with Ear and Brain

  2. 20-fold reinforcement malleus incus enters the upper (oval) window of cochlea stapes semicircular channels cochlea 2.5 windings30 mm length ear drum auricle 1 cm2

  3. oval window tectorial membrane scala vestibuli scala media scala tympani 1 mm auditory nerve inner hair cells outer hair cells basilar membrane endolymph liquid perilymph liquid 10-8 cm in 1/200 sec Corti organ Reissner‘s membrane 24‘000 hair cells 30-50 stereo- and 1 kino-ciliae

  4. George von Békésy 1961, Harvard U, Nobel prize stapes helicotrema round window high frequencies low frequencies

  5. colliculus inferior nucleus cochlearis gyri Heschl corpus geniculatum mediale nuclei superiores olivae nervus cochlearis 30‘000 nerve „cables“ 4 major transformations of data!

  6. cat brain low pitch cochlea high pitch multiple representation of same pitch

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