乙状窦前入路磨除岩部后壁的应用解剖

目的：为经颞骨岩部乙状窦前入路颞骨岩部的磨除提供解剖依据。方法：用15例成人尸头湿标本模拟经颅骨岩部乙状窦前入路进行磨除颞骨岩部的显微解剖研究。结果：岩部后壁磨除的范围可用一三角形表示；从岩乙状窦交叉点到后半规管最后部可磨除深度是4．52mm；从后半规管最后部到前庭小管可磨除深度是2．14mm；从前庭小管到总脚可磨除深度是1．88mm；从总脚到三角形的底可磨除深度是2．36mm。结论：岩乙状窦交叉点、内淋巴囊裂是磨除岩部后壁的重要标志。

Applied anatomy of drilling the posterior wall of the petrous pyramid through transpetrous presigmoid approach

Objective: : To provide anatomical basis for drilling the po sterior wall of the petrous pyramid through transpetrous presigmoid approach. Methods: A microanatomy study using 15 cadaveric adult heads on dr illing petrous bone was peformed through transpetrous presigmoid approach. Results: A triangle could be used to stand for the drilling range.In this triangle,drilling depth was 4.52 mm from the petrosigmoid intersection (PS) to the most posterior portion of the posterior semicircular canal,2.14 mm from the most posterior portion of the posterior semicircular canal to the vestibular aqueduct, 1.88 mm from the vestibular aqueduct to the common crus, and 2.36 mm from common crus to the trianglar base. Conclusion: PS and f issure of endolymphatic sac are important landmarks in drilling petrous bone.