ACB 8120 Lecture Notes - Lecture 79: Stria Vascularis Of Cochlear Duct, Internal Auditory Meatus, Ear Canal
12 Apr 2020
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Ducts are filled with and surrounded by unique fluids. Both fluids have ducts which are used to get rid of excess fluid. Activation of primary sensory neurons of cn viii. Cn viii through internal acoustic meatus to brain. Highly unique, high k+, high in positively charged amino. Synthesized by stria vascularis in scala media of cochlear acids duct. Synthesizes endolymph and is responsible for high k+ ion level in fluid. Only known vascular epithelium that is vascular. Volume/pressure appears to be regulated through endolymphatic duct/sac. Site of hearing cells (organ of corti) Specialized cells which sense changes in fluid movement. Movement of the cilia by fluid movement triggers influx of k+ ions (similair to ap) Electrical gradient is one of the largest in the body. Hair cells stereocilia are embedded in a gelatinous membrane (tectorial membrane) Motile cells which vibrate when inner hair cells are activated. Ganglion for sensory nerve fibers (spiral ganglion) found in the.
