Mcth-ods:Capsaicin(CAP) and substance P (SP) antiserum were subcutaneously injected into neonate rats,and intrathecally injected into adult rats.

• 方法：两级新生大鼠分别皮下注射辣椒素（CAP）和P物质抗血清，成年大鼠则于脊髓蛛网膜下腔注射。