Abstract：Objective:To provide anatomic data of lower cranial nerves to avoid damnification in the endoscopic surgery. Methods:To perform the postlabyrinthine and postsigmoid endoscopic surgery on 8 fomalin-fixed adult cadaver specimens, the lower cranial nerves was observed by endoscope, and the different approaches were compared at the same time. To excise the calvarium and cereburm , the nerves were exposed and observed, the distance from internal accoustic pore to glossopharyngeal was measured.Results:All postlabyrinthine endoscopic surgeries were performed successfully; only 4 postsigmoid endoscopic surgeries were performed as well. The distance from internal accoustic pore to glossopharyngeal was(8.26±1.05)mm.Conclusions:The lower cranial nerves endoscopic surgery can be performed successfully by postlabyrinthine, the “lockhole” technology by postsigmoid is not the appropriate lower cranial nerves endoscopic surgery. The internal acoustic porus is a fixed structure of the cerebellopontine angle; it is a perfect landmark to the surgery.
2013, Vol. 18 
