The average distance from suprameatal spine to vertical part of facial nerve was .7 mm, to chorda tympani nerve .9 mm, to promontory .8mm.
The average distance from suprameatal spine to vertical part of facial nerve was .7 mm, to chorda tympani nerve .9 mm, to promontory .8mm.
外耳道上棘至面神经垂直段、鼓索神经、鼓岬的距离分别为.7mm、.9mm和.8mm。