CSCD 3234 Study Guide - Midterm Guide: Timpani, Oval Window, Cochlea
26 Jan 2016
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Document Summary
Anatomy of the physiology of central nervous system. Muscles of the middle ear and what they do to me stiffness. Outer hair cells are sheared because they are attached to the tectorial membrane. Inner hair cells are sheared because of the drag created by the surrounded fluid when the membranes are displaced. Pumping action in the fluid which drags inner hair cells along. Leads to excitation of their associated auditory nerves. Excitation depolarization: upward displacement of bm, shearing toward lateral wall of the cochlea, open pore at base. Pressure wave starts at oval window, suppresses bm downward, organ of corti also moves downward. Dendrites: receive information from sensory cells or other neurons. Soma or cell bodies: process the information. Terminal buttons: passes the information on to another neuron, synapse to next higher order. 85 95% of all afferent fibers. Each ihc receives approximately 20 nerve fibers. Innervate inner hair cells exclusively which come from the habenula perforata.
