PHS 3341 Chapter Notes - Chapter 4: Vestibular Duct, Basilar Membrane, Cochlear Duct
7 Dec 2016
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Document Summary
Cns 4- reading - ear: hearing and equilibrium. Hearing is the neural perception of sound energy. Soundwaves are travelling vibrations of air that consist of regions of high pressure caused by compression of air molecules alternating with regions of low pressure caused by rarefaction of the molecules. Soundwaves often travel through other media less efficiently. Stretched across the entrance to the middle ear. Sound waves cause it to bow inwards and outwards. The air pressure remains neutral due to the atmospheric pressure of the external ear and the eustachian tube which connects the middle ear to the pharynx, opening causes the air to equilibrate. The sound wave reaches the ear closer first. Sound is less intense in the farther ear. Entrance to the ear canal is guarded by fine hairs and earwax (cerumen) Transfers the vibratory movements of the tympanic membrane to the fluid of the inner ear. Facilitated by a moveable chain of three small bones.
