Objective To explore the correlation between processus mastoideus and petrous apex pneumatization and high jugular bulb.
目得探讨乳突及岩尖气化与颈静脉球高位间得相关性。
It extends along the posterior margin of the petrous bone and passes through the hypoglossal canal into the parapharyngeal space.
病变沿岩骨得后缘延伸，经过舌咽神经管进入咽旁间隙。
The drilling area of posterior petrous bone could be enlarged and the exposure of operation could be improved by cutting off the endolymphatic sac.
离断内淋巴囊, 可扩大骨磨除的面积, 增加手术的暴露。
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