Middle ear (5) lateral wall or membranous wal鼓膜壁i! s formed by tympanic membrane epitympanic recess鼓室上隐窝 s r(的 弹喊护(5) lateral wall or membranous wall 鼓膜壁 :is formed by tympanic membrane epitympanic recess 鼓室上隐窝 Middle ear