Hearing Science Study Guide

Hearing Science Study Guide - Hearing Science Study Guide...

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Hearing Science Study Guide: Organ of Corti- End organ of hearing o Has sensory and supporting cells. o Sensory: 1 row of inner hair cells, 3 rows of outer hair cells Deiters cells : Located below hair cells and form the roof of the organ of corti Hensen cells: Next to Deiter Cells, Support OHC and tectorial membrane Claudius cells: Supporting cells on the basilar membrane Tectorial Membrane: Attached medially to the spiral limbus o Stereocillia are embedded in inferior surface o Movement causes cells to shear o Space between the membrane and the roof of the organ of corti is filled with endolymph Inner Hair Cells (IHC) o 3500 in a row o NO kinocillium o Responds to different frequencies of a signal Outer Hair Cells (OHC) o 12000-13000 in a single row o 3 -4 rows o Lengthen and shorten during stimulation of inhibition Neuron Fibers: o Receive both sensory and motor innveration o Most are sensory o Travels from hair cell, through habenual perforate, and gather in the modiolus in the spiral ganglion o Become myelinated as they travel throught the internal auditory meatus. Retrocochlear Anatomy- Neuron Fibers to Nerve: o 30,00 afferent/ 1800 efferent fibers gather to form the VIII (8 th ) nerve o Enters the brainstem at level of pons/ medulla o Travels through brainstem to auditory cortex First Order to Second Order Neurons- o Starts in the hair cells, and ends in the cochlear nuclei in the brainstem o All nuclei above this point will have information from both ears o The cochlear nucleus only gets information from one side, where all the other stops receive information from both cochleas and both ears Third to fourth order neurons-
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o Leave the inferior colliculus and ends at medial geniculate body of the thalamus All neurons continue to Hescl’s gyrus (Auditory Cortex) Tonotopic Organization-
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