目的 :观察国人颞骨岩部表面标志与内耳道 (IAC)的空间位置关系 ,定位内耳道中点 ,为外科手术提供解剖基础。　方法 :1 5例 (30侧耳 )甲醛固定的正常成人头颅标本 ,磨除内耳道表面骨质 ,暴露耳蜗 (C)、上半规管(SSC)、前庭 (V)等 ,用游标尺进行测量。　结果 ;双耳外耳道口上壁中点连线与双耳内耳道中点 (O)连线基本一致 ,该连线与鳞部内侧交点 (A)至内耳道中点距离为 (31 .5 9± 2 .33)mm。　结论 :熟悉内耳道毗邻解剖关系 ,有利于安全定位内耳道 ,扩大手术视野 ,减少并发症 OBJECTIVE: To observe the spatial relationship between the surface markers of petrous bone and the internal auditory meatus (IAC) and to locate the midpoint of the internal auditory meatus to provide an anatomic basis for surgery. Methods: Fifteen normal adult skull specimens fixed with formalin were excised from the surface of the internal auditory meatus to expose the cochlea (C), upper semicircular canal (SSC) and vestibule (V). Results The middle point of the upper wall of binaural auditory canal was consistent with the middle point (O) of the middle ear of the binaural. The distance between this point and the midpoint of the inner ear was (31.59 ± 2. 33) mm. Conclusion: Being familiar with the adjacent anatomy of the internal auditory meatus is conducive to the safe positioning of the internal auditory canal, expanding the field of vision and reducing the complications