以下为句子列表：
英文: The nerve-related arterial trunks were divided into threesegments based on their relationship to the nerves and the meatus: the premeatal,meatal, the postmeatal segments.
中文: 多数为一支( 侧，90%), 二支有侧(0%),依据其与面神经和内听道的关系，小脑前下动脉分为三段：内听道前段、内听道段、内听道后段，内听道前段多位于面神经前下方，内听道段及内听道后段多位于神经的下方。
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