Lecture 7 - Ear Outer Ear(sound enters External Ear...

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Unformatted text preview: Ear Outer Ear (sound enters) External Ear External Ear Canal Tympanic Membrane (Eardrum) Middle Ear (amplifies vibration) Malleus (hammer) Incus (anvil) Stapes (strum) Eustachian Tube—equalizes pressure Inner Ear (vibration of fluid) Oval Window Cochlea (Vestibular Canal Cochlear Duct Tympanic Canal) Round Window Cutaway of the cochlea The Three Canals of the Cochlea Vestibular Canal—where vibrations are first transmitted from the stapes through the oval window Cochlear Duct—where hearing takes place Tympanic Canal—where vibrations leave the system Cochlear Duct--Organ of Corti—hair cells that act as sensory receptors have specialized cilia extending from their surface--Tectorial Membrane--Basilar Membrane—vibrations in the fluid causes it to move up and down which causes hair cells to vibrate—different parts of the basilar membrane react to different frequencies--deformation of the membrane of the hair cells causes action potential that goes through the nerves into the brain Ut r icle and Saccule Hair cells contained in gelatinous cupula Stimulated by calcium carbonate otoliths Semicircular Canals Gelatinous cupula contains the hair cells Stimulated by fluid movement The Endocrine System Glands—can be multicellular or unicellular...
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This note was uploaded on 04/06/2010 for the course BIO 01-119-10 taught by Professor D'arville during the Fall '09 term at Rutgers.

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Lecture 7 - Ear Outer Ear(sound enters External Ear...

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