LING 3P97 Lecture Notes - Lecture 4: Cochlear Duct, Basilar Membrane, Tectorial Membrane
15 May 2016
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Unit 2: anatomy and function of the inner ear http://course. zju. edu. cn/532/study/theory/2/sensory%20system/effect%20of%20sound%20waves%20on. Vestibule and semi-circle canals- sensory organ for balance. Fig 1-11: cochlea, semi-circle canals and connecting vestibule between them. Fluid in semi-circle canals moves forward when your head moves forward. Vertigo- need to sit down if move head to quickly. Within the petrous portion of the temporal bone. Mechanical vibrations from middle ear are transduced to pressure variations (fluid) and eventually to neural impulses in the auditory branch of the 8th nerve: pressure variation in fluid= beginning of hydromechanical events in the cochlea. Due to small size of the cochlea vibrations received instantaneously and simultaneously throughout the entire cochlea at once. The membranous labrynth (scala media) also receives pressure variations, however it"s the reactions of the basilar membrane that are most important to these vibrations and most important in hydromechanical process. Has 2. 75 turns when rolled up: first basilar turn, then apical turn (inside)
