Hearing - Hearing Ear Outer Ear Pinna External Auditory...

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Hearing Ear Outer Ear Pinna External Auditory Meatus Secretes Cerumen (wax) to trap dust, dirt, and small animals cilia moves wax out Small acoustic resonator (~1 in or 2.5cm) open at one end, closed at the other high frequencies are resonated (unvoiced consonants) Middle Ear Tympanic Membrane (TM) Ossicular Chain suspended from roof of ME by tiny ligaments Malleus, Incus, Stapes articulate with each other Malleus attached to the TM and Stapes rests in the Oval window of the cochlea Both TM and Ossicular chain shaped and especially sensitive to speech frequencies ME is a hollow cavity connected to the pharynx by the Eustachian Tubes allows for pressure equalization Inner Ear Cochlea and vestibules encased in the temporal bone (one of the hardest bones in the body) Certain parts are frequency specific hair cells will respond from 20-20,000Hz performs a Fourier Analysis of the incoming sound each hair cell has its own nerve fiber to send transmission to the brain neurons take time to recover after firing, we really don't know how we 'hear' The hydraulic wave continues all the way up the cochlea sound received in one ear goes to the contralateral temporal lobe via the thalamus. reception can cross to the other lobe via the corpus colossum after it reaches the
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This note was uploaded on 01/17/2012 for the course SPTH 3311 taught by Professor Logan during the Fall '11 term at University of Central Arkansas.

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Hearing - Hearing Ear Outer Ear Pinna External Auditory...

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