采用显微解剖学和传统解剖学方法，经迷路下后进路对２５具成人头颅５０侧内耳道标本进行了观察。对切断前庭神经的最佳部位进行了解剖学评估，认为经迷路下后开放内耳道为最佳进路。对中间神经的出现率和解剖部位进行了观察，并探讨了迷路动脉走行与内耳道各壁的关系。为防止在开放内耳道时损伤前庭和耳蜗，提出将单孔作为内耳道底的解剖标志。 By means of microanatomy and traditional anatomy, we observed the internal auditory meatus of 25 adult skulls after labyrinthine approach. Anatomical assessment of the best site for cutting off the vestibular nerve is considered to be the best route to open the internal ear canal after getting lost. The incidence and anatomic location of the interneurons were observed, and the relationship between the movement of the labyrinth artery and the walls of the internal auditory canal was also discussed. To prevent damage to the vestibule and cochlea during the opening of the inner ear canal, a single hole was proposed as an anatomical landmark for the inner ear canal floor.