最近医生们可通过枕下进路切除内耳道及小脑脑桥角肿瘤,并保留听力,但此进路有损伤迷路的危险。为了从枕下进路暴露听神经瘤的小管内部分.必须移除内耳道的后壁。迷路位于后岩尖,与内耳道后壁非常接近。在移除后壁时,迷路的内淋巴间隙可能被打开,因而造成不可修复的感觉神经性聋。若要保存迷路,必须了解内耳道与后半规管的壶腹,前庭及总脚之间的关系。本文目的是用定量解剖技术以确定由枕下进路手 Recently, doctors can cut off the internal auditory meatus and the cerebellopontine angle tumor through the suboccipital approach and keep their hearing. However, this approach can damage the risk of getting lost. In order to expose the inner portion of the acoustic neuroma from the suboccipital approach, the posterior wall of the inner ear canal must be removed. Lost in the post-rock tip, and the posterior wall of the ear canal very close. When the posterior wall is removed, the lost endolymphatic space may open, resulting in irreparable sensory nerve deafness. To preserve the lost, one must understand the relationship between the inner ear canal and the ampulla, the vestibule and the total foot of the posterior semicircular canal. The purpose of this article is to use quantitative anatomical techniques to determine the approach by the occipital lobe