Biology of Hearing- Quiz 3 Study Guide.pdf

Biology of Hearing- Quiz 3 Study Guide.pdf - Biology of...

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Biology of Hearing: Quiz 3 Study Guide Cochlear Cross Section: Watch: The Human Cochlea Ø The function of the Cochlea is to transform vibrations of the cochlear liquids and associated structures into a neural signal. The Cochlea is a spiral snail-like structure 1cm wide. Ø The osseous spiral lamina divides the Scala vestibule from the Scala tympani on the side near the Modiolus . Ø The Scala media is separated from the Scala vestibule by Reissner’s membrane , and from the Scala tympani by the basilar membrane . Ø The Scala vestibule and Scala tympani contain perilymph , a fluid which is similar to extracellular fluid in its ionic composition. Ø The Scala media forms an inner compartment, and contains endolymph . Endolymph has a high K + concentration and a low Na + concentration, creating a high positive potential.
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Organ of Corti: Watch: Ear Organ of Corti Ø The vibrations of the stapes are transmitted to the oval window. The fluid in the cochlea is displaced to the round window, opening onto the Scala tympani . The flow causes a wave-like displacement of the basilar membrane and the structures attached to it. This is what is responsible for stimulation of the hair cells . Ø The first stage of the analysis of the incoming sound is performed by the special distribution of the resulting wave-like displacements.
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