Communication Sciences and Disorders 4417A/B Study Guide - Final Guide: Arnold Tongue, Tectorial Membrane, High-Pass Filter
11 Mar 2014
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Ihc transduce mechanical vibration into electrical activity in the auditory nerve. Inner tunnel of corti is filled with cortilymph. Ihc vs ohc: same parts, different shapes, inner are more like a light bulb, ohc have more rectangular, elongated shape with three rows of chevron pattern stereocilia. 1: at the top the part exposed to endolymph is stereocilia (similar to but have no internal structure and are motile, synapse between nerve fibers and cells to carry info. Influx of positive ions changes the voltage of cell = depolarization: this converts it to an electrical signal mapping the motion of the bm. Traveling waves: characteristic frequency the frequency to which a particular place on the bm is tuned, yost defined this as critical or central frequency, mapping of frequency to a place of vibration on the bm. If we look at one of these spots over time with one frequency we can trace the envelope of the traveling wave.
