PSYCO275 Lecture Notes - Lecture 10: Tectorial Membrane, Basilar Membrane, Oval Window
25 Apr 2019
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Document Summary
Mechanical displacement of molecules caused by changing pressure. Number of cycles completed in a given time (hz) Fundamental frequency: the rate as which the complex waveform pattern repeats. Overtones: higher-frequency sound waves that vibrate at whole number multiples of the fundamental frequency. Pinna catches sound waves and deflects them into external ear canal. External ear canal amplifies sound waves and directs them to eardrum. On the inner side of the eardrum is the middle ear (contains 3 middle ear bones- ossicles) Ossicles amplify vibrations and conveys them to the membrane covering the cochlea"s oval window. Basilar membrane (containing outer and inner ear hair cells) is inside cochlea. Cilia on the basilar membrane loosely contact the tectorial membrane. Sound waves traveling through cochlear fluid bend the basilar and tectorial membranes, stimulating hair cells. Movement of basilar membrane produces a shearing force in the cochlear fluid that bens the cilia.
