论文部分内容阅读
目的 为枕下乙状窦后入路安全磨开内耳道后壁提供解剖参数。方法 应用１０ 例甲醛固定的汉族成人头颅湿性标本， 以内耳道为中心进行了 Ｃ Ｔ 断层薄扫， 在手术显微镜下磨开内耳道后壁， 保护骨迷路， 用游标卡尺、量规进行了测量。结果 （１） Ｃ Ｔ 断层薄扫可较好地显示骨迷路与内耳道后壁的关系及岩锥气化程度， 高颈静脉球现象； （２） 在小脑最大牵开程度不大于６１°情况下，不伤及骨迷路， 平均最大磨开内耳道后壁接近总长的２／３ ， 有５ 侧标本低于内耳道总长的５０ ％ ； （３）内耳道后外侧唇与前庭、半规管总脚的距离， 及后垂直半规管与岩锥后表面的距离， 个体变异较大。结论 从该对比研究， 测量 Ｃ Ｔ 断层扫描、磨开内耳道确定前庭、半规管总脚与内耳道后外侧唇的距离， 对比变异不大， 所以术前 Ｃ Ｔ 内耳道断层可以指导术中安全磨开内耳道后壁。
The purpose of the suboccipital sigmoid sinus posterior access to safe dissection of the posterior wall of the auditory canal to provide anatomical parameters. Methods 10 cases of formalin-fixed adult Han cadaver wet specimens were dissected. The C-T scan was performed centering on the internal auditory canal. The posterior wall of the internal auditory canal was ground under a surgical microscope to protect the bony labyrinth and was measured with a vernier caliper and a gauge. Results (1) The thin C-scan can better show the relationship between the bony labyrinth and the posterior wall of the internal auditory canal and the pyrolysis degree of the pyramid and the phenomenon of the jugular bulb. (2) In the case of maximal retraction of the cerebellum not more than 61 ° , Without injury and bony labyrinth, the average maximum open the posterior wall of the inner ear near the total length of 2/3, 5 specimens less than 50% of the total length of the ear canal; (3) the posterior lateral ear and vestibular canal, Of the distance, and the vertical semicircular canal and the rock cone rear surface distance, individual variation larger. Conclusions From this comparative study, the C T-CT scan was measured to determine the distance between the vestibular and semicircular canal feet and the posterior lateral lip of the auditory canal, Open the posterior wall of the ear canal.