聲波的正確傳導方向是:
耳膜→鎚骨(malleus)→砧骨(incus)→鐙骨(stapes)→卵圓窗(oval window)
耳膜→砧骨→鎚骨→鐙骨→卵圓窗
耳膜→鎚骨→砧骨→鐙骨→圓窗(round window)
耳膜→砧骨→鎚骨→鐙骨→圓窗