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用30条已防腐的成人脊柱,从椎间盘处横锯,测量了各段椎管与内容物的矢径。椎管内硬膜前组织较薄,一般不超过2.0mm,硬膜后组织,由上向下逐渐变厚。椎管与硬膜囊的比值(矢状径)颈段为1:0.73,胸段1:0.68,腰段为1:0.60。从本组材料看,C_(3-5)椎骨段有50％以上椎管矢径较细窄,蛛网膜下腔亦较窄,故受压后缓冲余地小,易出现症状。腰段由上向下硬膜囊的逐渐变小,周围组织逐渐增多,故不易受压。
With 30 preserved adult spine, from the intervertebral disc at the saw, measuring each section of the spinal canal and the contents of the vector. Prefrontal spinal canal thinner tissue, usually not more than 2.0mm, after the dura mater, gradually thickening from the top down. The ratio of spinal canal to dural sac (sagittal diameter) was 1: 0.73 for the cervical segment, 1: 0.68 for the thoracic segment, and 1: 0.60 for the lumbar segment. From this group of materials, C_ (3-5) vertebral segment of more than 50% of the spinal canal narrower narrower, subarachnoid space is also narrow, so the pressure after the buffer zone is small, prone to symptoms. Lower lumbar dural sac from the downward gradually smaller, the surrounding tissue gradually increased, it is not easy to be pressured.