At4 weeks postoperatively, cholinesterase( CHE) and acidphosphatase( ACP) histochemical stain of neurons in C5 anterior horn and dorsal root ganglia( DRG) were detected.

• 术后4周取颈5脊髓前角和脊神经节,行酶组织化学染色观察胆碱酯酶和酸性磷酸酶活性的变化。