Tympanic cavity鼓宣 (3) Anterior wall or carotid wal颈动脉壁:□ Upper opening for tensor tympani m lower opening for auditory tube咽鼓管鼓室口 (4) Posterior wall or mastoid wal乳突壁 Aditus of mastoid antrum:乳突窦的入口; Pyramidal eminence锥隆起:内藏镫骨肌.(3) Anterior wall or carotid wall 颈动脉壁 : Upper opening for tensor tympani m. lower opening for auditory tube 咽鼓管鼓室口 (4) Posterior wall or mastoid wall 乳突壁: Aditus of mastoid antrum: 乳突窦的入口； Pyramidal eminence 锥隆起： 内藏镫骨肌. Tympanic cavity 鼓室