KNES 259 Lecture Notes - Lecture 23: Eustachian Tube, Semicircular Canals, Tectorial Membrane
22 Nov 2016
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Document Summary
Knes 259 sensory systems the comprehensive guide to (cid:858)the ear(cid:859) and hearing (transduction of sound) Intensity: related to amplitude (the volume of a sound); frequency remains the same but wave is larger or smaller; also known as the magnitude of change from the mean position, either to the top or bottom of a crest. Pitch/tone: related to frequency (cycles per second); slow waves are low pitch and fast waves are high pitch. Timbre/quality: overtones (overlaying other frequencies on top on one another) The middle ear: consists of the eardrum (tympanic membrane), auditory ossicles, and. The inner ear: consists of the cochlea (where sound is transduced), semicircular canals, and the utricle and saccule. The cochlea contains the organ of corti (a structure responsible for transduction of sound via receptor cells called hair cells) Sound waves make ripples in the two different fluids of the cochlea: endolymph: thicker fluid, perilymph: thinner fluid that flows better than endolymph (composition is similar to csf)
