计算每个椎间隙处的硬膜囊横断面积。
Thecal sac cross-sectional area was calculated at each disc space.
髓鞘层数和轴突横断面积二者之间为正相关（P＜0.01）。
The numbers of layer in myelin was positively related to transverse axonal area( P <0.01 ) .
结论：上述数据解决了腰椎损伤后多裂肌横断面积是否迅速减少的疑问。
Conclusions. These data resole the controersy that the multifidus cross-sectional area reduces rapidly after lumbar injury.
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