External ear 3 tympanic membrane鼓膜: Flaccid part松弛部: upper114 Tense part紧张部: lower3/4 Umbo of tympanic membrance 鼓膜脐 Cone of light光锥External ear 3. tympanic membrane 鼓膜: Flaccid part 松弛部: upper 1/4 Tense part 紧张部: lower 3/4 Umbo of tympanic membrance Cone of light 光锥 鼓膜脐