充分暴露外半规管轮廓和砧骨窝，保持骨性外耳道后壁的完整。
Outside the full exposition the semicircular canals outline and the anvil nest, maintains the osseous external auditory meatus behind completeness.
目的：寻找乙状窦前入路中骨性半规管的轮廓化方法和内淋巴囊的识别标志。
Aim:To seek the landmark of bony semicircular canal and inner lymph sac.
面神经乳突段及骨性半规管未发现明显变异。
No variations of the mastoid segment of facial nerve and the bony semicircular canals were observed.
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