Nervous System - Sensory

Coding for acceleration utricle and saccule bulges

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Unformatted text preview: Perilymph Scala vestibule Scala Tympani Endolymph Scala media High concentration of potassium ions Receptor cells for sound Stereocilia Tips embedded in tectorial membrane Oriented short to tall Surrounded by endolymph The stapes vibrates due to the tympanic membrane vibrating, and stapes vibrate the oval window. The stereocilia are located in an area of high K+ concentration Bend to tall sterocilia Channels open depolarize Bend to short stereocilia, channels close hyperpolarization Frequency coding: pitch Coded for by where on the basilar membrane deflection occurs Neural Pathways for Sound Hair Cells = receptor cells = modified neurons Hair cells synapse on afferent axons of CN VIII Axons make up cochlear nerve One hair cell per cochlear nerve fiber Cochlear nerve enters brainstem Synapses with second- order neuron Second- order neuron to medial geniculate nucleus of thalamus Synapse on third- order neuron to auditory cortex Auditory cortex has...
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This document was uploaded on 03/23/2014 for the course BIOL 175 at Georgetown.

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