Results: The medullar conus ends at the level of L 1 vertbral lamina, and the exit of l 1 radix on the dura is also in the region of L 1 vertebral lamina.

• 观测该区域神经根位置、形态及其与周围组织的关系。 结果 :脊髓圆锥末端大多数平对L1椎板。