Four rats were randomly selected 1 week later,and their horseradish peroxidase(HRP) positive cells were then observed in dorsal root ganglions(DRGs) at C2-C5 by TMB method after receiving HRP injection in the same sites.

• 1周后,随机挑选4只大鼠行颈背部皮内注射辣根过氧化物酶(HRP),再用神经束路追踪术(TMB法)观察大鼠颈2~5(C2~C5)背根神经节(DRG)内HRP阳性细胞的分布。