Results: ① The greater superficial petrosal nerve was an important landmark in drilling petrous bone. Backing it we can find out the intrapetrous carotid artery ( ICA), cochlear and geniculate ganglion ( GG); 结果:①岩大神经是磨除颞骨岩部十分重要的标志,通过它可以定位岩部颈内动脉、耳蜗和膝状神经节;