SP, as the matter released from termination of primary afferent nerve, take a very important role on the aspect of convection and regulation of harmful irritating information.

• SP作为初级传入神经末稍释放的物质，对伤害性刺激信息的传递和调控方面，扮演着至关重要的角色，检测SP也是判断镇痛药疗效的重要方法。