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1.Discovered by using endoscopy, the CPA was divided into 4 levels: petrosal veinand arachnoid mater, acousticofacial bundle, trigeminal and abducens nerves, and lower cranial nerves(glossopharyngeal,vagus, and accessory).
内镜下由浅入深、由上至下可分为4层,即岩静脉层、面听神经层、三叉神经-外展神经层和低位颅神经层。收藏指正
2.below the dura mater but above the arachnoid membrane of the meninges.
硬脑（脊）膜以下脑蛛网膜以上。收藏指正
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