The Human Ear 人耳结构英文幻灯

TheHumanEarDefinition:theorganhumansusetodetectsound.•Pictureasatellitedishthatcollectsradiowaves.•Theouterearissimilar!–Thecurvedformationontheoutside(thepinna)helpsfunnelsounddowntheearcanaltotheeardrum.TheMiddleEar•Themiddleeartransferstheenergyofasoundwavebyvibratingthethreebonesfoundthere.BonesoftheMiddleEarHammerAnvilStirrupEardrum•Thesearethesmallestbonesinyourbody!•Together,they’reaboutthesizeofanorangeseed.TheStirrup(orstapes)HowSoundTravelsintheMiddleEar•Whensoundwavesreachthemiddleear,theycausetheeardrumtovibrate.•Thisvibrationthencausesthethreebonestovibrate.•Thesevibrationsaretransformedintolongitudinal/pressurewavesinthemiddleear.TheInnerEar•Twomainparts:–Cochlea–AuditoryNerveTheCochlea•Coiledlikeasnailshell•Containsapproximately300,000haircells•Isfilledwithfluid,throughwhichsoundcantraveleasily.CochlearHairCells•Thesetinyhairsbendbecauseofthevibrationscausedbythesoundwaves.CochlearHairCellsinActionTheAuditoryNerve•Thetinyhaircellsofthecochleaaresetinmotionbyvibrations•Thevibrationsstimulatetinynervecells.•Thenervecellsthensendsignalsalongtheauditorynervetothebrain.Asoundisnotactuallyhearduntilthebrainreceivesandprocessesthesesignals.Let’sstartattheverybeginning…•=CSO765hyxrcPutthefollowingstepsinorder:A.Thestirrupmovesbackandforth,creatingpressurewavesinthecochlea.B.Thebonesofthemiddleear(hammer,anvil,&stirrup)vibrate.C.Haircellssendanelectricalimpulsethroughtheauditorynerve.D.Theouterpartoftheear(thepinna)catchesthesoundwaves.E.SoundwavesvibratetheeardrumF.Thebrainreceivesanelectricalimpulseandinterpretsitassound.G.Tinyhaircellsinthecochleamoveasthewavespass.H.Thesoundwavestravelintotheearcanal.DHEBAGCF