Conclusion After passing through dural sac, since the sequences, start points and angles are different, the relationship between nerves and intervertebral discs are varied.

• 结论神经根自硬膜囊发出后，因序列不同，出发点及角度均不同，与椎间盘关系亦不同，在作髓核摘除时应避免损伤；