听神经瘤涉及的面神经段显微解剖学研究

目的探讨听神经瘤涉及的面神经段的显微解剖，为听神经瘤手术提供解剖学数据。方法利用福尔马林充分同定的15例成人尸头标本，对面神经的脑干端、桥小脑角段、内耳道段及其毗邻结构进行测量和拍照。结果面神经脑干端与周围解剖结构有恒定距离。桥小脑角段由面神经运动根、中间神经两个根组成，与前庭蜗神经走行关系恒定。内耳道段处面神经运动根在前庭蜗神经前上方，中间神经和面神经运动根在内耳道中部合成一干，近内耳道底处面神经在内耳道底的横嵴上．垂直嵴前走行。结论研究听神经瘤涉及的面神经段显微解剖，有助于听神经瘤的切除．保护面神经。

Microanatomy of facial nerve segment related to acoustic neuromas

Objective To study the microanatomy of facial nerve related t o acoustic neuromas so as to provide the anatomic data and the techniques of int raoperative protection of facial nerve for surgery. Methods 15 corpse head s treated with formaldehyde solution were involved in the basic research, with t heir brain stem, cerebellopontine angle, internal auditory canal and adjacent st ructure relevant to facial nerve were measured and photographed. Results T here was a regular distance between the brain stem segment and the adjacent stru cture. The cerebellopontine angle segment was composed of motor root and interme diate nerve and showed a regular relation with vestibulocochlear nerve in their pathways. At the segment of internal acoustic meatus, the motor root of facial n erve had its root in the anterosuperior vestibulocochlear nerve and converged in to one with the intermediate nerve in the middle of internal acoustic meatus. Ne ar the floor of internal acoustic meatus, the facial nerve extended along upper transverse crest and anterior vertical crest. Conclusion The microanatomy o f facial nerve related to acoustic neuromas is helpful for the removal of acoust ic neuromas and intraoperative protection of facial nerve, which is the anatomic base to reserve facial nerve in the operation of acoustic nearomas.