External ear 2. external acoustic meatus外耳道 bony part骨部: medial23 cartilaginous part软骨部: lateral1/3 听4青 青平规 内N巴 Ossein aotu Canales semcrcutares ossei/Saccus no 内 内养脉 Processus styloideus 内动脉 carotis interns2. external acoustic meatus 外耳道: bony part 骨部：medial 2/3 cartilaginous part 软骨部：lateral 1/3 External ear