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经小脑延髓裂入路的显微解剖观察 被引量:4

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摘要 目的研究小脑延髓裂入路相关四脑室周围解剖关系及暴露范围。方法 10例20侧国人成人头颅湿标本,模拟经小脑延髓裂入路逐层解剖。对相关结构进行显微解剖,测量此入路所暴露第四脑室底宽度、小脑后下动脉(PICA)及分支距椎动脉硬膜穿行处平均直线距离。结果经小脑延髓裂入路,纵向可显露从闩至导水管下口,侧向可显露从闩至外侧孔的四脑室底及桥脑背外侧区域。四脑室底长为:(38.6±0.52)mm,导水管下口至闩部距离宽为(17.5±0.49)mm,高为(26.7±0.5)mm。小脑后下动脉的扁桃体延髓段是该入路所涉及的重要血管,扁桃体延髓段走行于小脑扁桃体的下极与延髓之间的裂隙内,本组中上袢未发现变异,其下袢位置变异度较大。PICA及分支距椎动脉硬膜穿行处平均直线距离:延髓支起源:左侧(11.70±1.07)mm,右侧(6.00±0.66)mm。脊髓后动脉起源左侧(5.90±0.38)mm,右侧(10.20±0.86)mm。椎动脉起源左侧(11.00±1.0)mm,右侧(12.80±0.74)mm。结论四脑室周围解剖结构极为重要,小脑延髓裂入路利用小脑自然间隙操作,在不需切开下蚓部的情况下,可充分暴露四脑室的任何部位,通过外侧隐窝可到达脑桥和延髓的背外侧,可减少颅神经及脑干损伤,为第四脑室肿瘤手术提供了一条新途径。
出处 《宁夏医科大学学报》 2013年第11期1256-1258,1310,共4页 Journal of Ningxia Medical University
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