anGeneralFeaturesThreepartsExternalear外耳:collectssoundwavesMiddleear中耳:transmitssoundwavesInternalear内耳:ansofhearingandbalanceExternalEar外耳Auricle耳廓Externalacousticmeatus外耳道Tympanicmembrane鼓膜Auricle耳廓★wopartsCartilaginouspart-lateral1/3Bonypart-medial2/3LinedbyalayerofthinskinThisS-shapedpassagemedially,atfirstforwardandupward,thenbackwardand,finallyforwardanddownwardInbabyhood,itisshorterandmorehorizontalthaninadultTympanicMembrane鼓膜Athinovalmembrane,avity★idpart松弛部:upper1/8~1/6Tensepart紧张部:lower5/6~7/8,pearlygrayUmbooftympanicmembrane鼓膜脐Coneoflight光锥outersufaceofskin,innersurfaceofmucousmembraneAcuteotitismedian急性中耳炎Perforation,inflammationortrauma鼓膜穿孔(炎症或外伤)★avity鼓室Auditorytube咽鼓管Mastoidantrum乳突窦andmastoidcells乳突小房
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