首先是上位延髓段，它包括了从小脑后下动脉起始处到橄榄体最高突起的连线之间的区域。
Next is the lateral medullary segment, which extends from the olive to the origins of Cranial Nerves IX, X, and XI.
经探测及计算发现、小脑和橄榄体桥脑萎缩病人与VA的管径狭窄和血流量减少有密切而直接关系。
By detection and computation, we found the patients who got cerebellum atrophy or brain stem atrophy often accompanied by the narrow diameter and less blood-flow of VA.
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