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ID:58869269
大小:2.57 MB
页数:17页
时间:2020-09-21
《基础医学各论III课件:2_感觉器官B.pdf》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、2013/9/17Part3.AuditorySenseAuditoryygOrgan--EarEarhearssoundSoundisamechanicaldisturbancepropagatedthroughanelasticmedium12013/9/17HearingThreshold•HearingThreshold¢PressrethresholdPressurethreshold•FrequencyRangeofhearingofthehumanear¢20~20000HzStructureoftheEar•Externalear•Mi
2、ddleear•Innerear22013/9/1732013/9/1742013/9/17AuditoryFunctionofEar•Conductionsystemofsound¢Pinna,Externalauditorycanal,Tympanicmembrane,Ossicularchain(Malleus,Incus,Stapes),ovalwindow,scalavestibuli,Vestibularmembrane,Cochlearduct,basilarmembrane,scalatympani,roundiddwindow.•Re
3、ceptorsystem¢OrganofCorti52013/9/17Conductionsystem--ExternalEar•Pinna:helpingtopinpointthelocationofsounds•Externalauditorycanal:AresonatorConductionsystem--MiddleearPotentconductionofsoundfromthetympanicmembranetothhhecochllea•Tympanicmembrane•Ossicularchainmalleus,incusandsta
4、pes•Eustachiantube62013/9/17InnerEar•Cochlea•VestibularapparatusConductionsystem--InnerearPathwayofconductionofvibrationintheinnerearvibrationintheinnerear•TwoMembranes¢Vestibularmembrane¢Basilarmembrane¢OrganofCorti•Threettbubes¢Scalavestibuli¢Cochlearduct¢Scalatympani72013/9/1
5、7Twotypesofsoundconduction•AirconductionAirconduction•BoneconductionReceptorsystem--OrganofCorti82013/9/17Mechanismofhaircellexcitation•Excitationofthehaircell92013/9/17Thesenseofthedifferentfrequencysound•TravelingwavetheoryTraveloftheVibrationWaves•Patternofvibrationofthebasil
6、armembranefordifferentsoundfrequencies¢Low-frequencysound¢Medium-frequencysound¢High-frequencysound102013/9/17HearingAbnormalities•Typesofdeafness¢Nervedeafness•Impairmentoftheauditorynerve•Impairmentofthecochlea¢Conductiondeafness•TreatmentofdeafnessTreatmentofdeafness¢Audiphon
7、e¢Artificialcochlea112013/9/17Part4.VestibularApparatusStructureofvestibularapparatus•Utricle,saccule,semicircularcanals122013/9/17FunctionsoftheVestibularapparatus•Thevestibularsystemdetectschangesinthemotionandidpositiifonofthhehhdeadbhbytheuseofffflluiidd-filldfilledtubes.¢To
8、provideasubjectivesensationofmovementandpositio
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