1. 鼓膜：鼓膜:鼓膜(tympanic membrane)介于鼓室与外耳道之间,为向内凹入、椭圆形、半透明的膜性结构;高约9mm、宽约8mm、厚约0.1mm. 鼓膜的前下方朝内倾斜,与外耳道底约成45°~50°,故外耳道的前下壁较后上壁为长. 新生儿鼓膜的倾斜度尤为明显.
2. 外耳：前庭蜗器 external ear | 外耳 tympanic membrane | 鼓膜 tympanic cavity
1. The earphone is so tiny that it slipped into the student's auditory canal, causing a perforation of the tympanic membrane.