1,2,3,4,6 weeks after nerve injury,10%BDA solution was injected into the sciatic nerve trunk by a microsyringe proximal to the injury site.

• （2）光镜观察：急性压迫损伤后一周时，在神经切断结扎近侧可见到标记阳性的神经纤维。 说明此种损伤至少在损伤后一周时其轴突运输未受明显影响。