CSD 212 Chapter 3: OVERALL STRUCTURE OF THE AUDITORY SYSTEM
22 Dec 2017
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Document Summary
Ossicles: malleus incus stapes (hammer hits the anvil to make a stirrup: transfer movements of the larger tympanic membrane into movements of the smaller oval window. Eustachian tube: middle ear-nasal cavities: drains fluid, equalizes pressure, removes cellular waste from middle ear, usually closed by a valve in which the middle ear stays at the pressure of the air. Force and sa increase pressure at oval window. Attenuation tympanic reflex: onset of a loud sound triggers a neural response which causes muscles to contract. Chain of ossicles becomes rigid: sound conduction is diminished. Inner ear | consists of cochlea (auditory) and the labyrinth (vestibular) Cochlea fluid-filled = transforms physical motion of the oval window membrane into a neuronal response. Two membrane covered holes: oval window and round window. Organ of corti | (main sensory organ of hearing) Contains hair cells = site of transduction. Responds to changes in pressure of inner ear fluid - senses movements of the basilar membrane.
