It was observed that when the stimulation intensity reached the threshold of C fiber,the NRM neurons were obviously activated,and when it reached or exceeded theintensity for producing the maximal C wave,the NRM neurons were highly acti-vated.

• 可明显激活中缝大核神经元,当刺激强度达到可引起最大 c 波时,激活 NRM 的效应也达到最大。