LING 2P91 Lecture Notes - Lecture 10: Trigeminal Nerve, Ossicles, Eustachian Tube
15 Jan 2016
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Document Summary
Transformed to electrochemical changes by the nerve endings and sent to. Analyzes sound using changes in frequency and intensity. Picture: external ear (pinna), tymphanic membrane (start of middle ear: malleus (biggest), incus, stapes smallest), inner ear (cochlea-hearing piece) External auditory meatus (ear canal) leads to tympanic membrane (ear drum) Channels sound waves into the ear combination of original. Distinguishes noises from front or back of head. Cartilaginous portion produces cerumen (wax) and contains cilia tympanic membrane. Protect middle and inner ears from physical damage/abuse. Also warms air that enters to make it more similar to air on other side of. Sound waves are reflected off folds of pinna so sound entering ear are. 1/4 wave resonator (open at one end so enhances sound pressure at closed. Can calculate lowest resonant frequency of the canal f x wavelength. Due to length, tends to be high freq sounds. Pinna and eam together are considered a broadly tuned resonator end)
