The ex-perimental group with NGF showed reg ular longitudinal arranged regenerating nerve fiber ,mature myelin sheath and organelle as the control group(P>0.05).

• B组再生神经与对照组相似(P>0.；05)；再生神经以有髓纤维为主；髓鞘较厚; A组再生神经数量、髓鞘厚度等指标与B、C组之间有显著性差异(P<0