Methods: The facial nerve and its adjacent structures in the CPA were observed in 30 sides of adult cadaver head specimens with the retrolabyrinthine approach underwent through endoscope.

• 方法：正常成人头颅标本15例（30侧），模拟迷路后入路在内窥镜下观察面神经及其与前庭蜗神经和相关血管的毗邻关系。