藉助手术显微镜,本文经鼓泡外上壁进路,对10只家猫(20耳)的中耳结构作显微镜观察和测量。锤柄下端向下延伸至鼓膜的下4/5,锤柄长与鼓膜接触面大,砧长脚较短,锤骨柄与砧长脚杠杆之比为3倍,其鼓膜有效振动面积与镫骨底板面积之比为23.6倍,声压将被提高70.8倍。因此,猫的鼓室扩音功能远比人耳为大。 With the aid of surgical microscope, the middle ear structure of 10 domestic cats (20 ears) was observed and measured microscopically by bubbling the upper wall. The lower end of the hammer handle extends down to the lower 4/5 of the tympanic membrane, the length of the hammer handle and tympanic membrane contact surface is large, the anvil long leg is shorter, the ratio of the hammer handle to the anvil long-leg lever is 3 times the effective vibration area of ​​the tympanic membrane Floor area ratio of 23.6 times, the sound pressure will be increased 70.8 times. Therefore, the cat’s tympanic amplification is far greater than the human ear.