In the present experiment

the late train discharges (c-response) of the wide dynamic range (WDR) neurons evoked by intense electrical stimulation of the skin were taken as nociceptive response. The inhibition produced by muscle spindle afferent elicited by electroacupuncture at "Zusanli" was observed. The results are as follows: 62 WDR neurons were observed in 27 SD rats. 21 were treated by "Zusanli" electroacupuncture

15 (71. 43% ) of which were inhibited; 14 were treated by electroacupuncture at the point about 0. 5cm lateral to "Zusanli" and avoiding other acupoints nearby. The rate of c-response inhibition is 35. 71 %. The inhibition rate of another group is 31. 25 % which local muscle spindles were destroyed by injecting Bubicaine. The results indicate that the inhibition of c- response induced by electroacupuncture at "Zusanli" point is due to the afferent of local muscle spindles excited by electroacupuncture

and identify the afferent of muscle spindles has analgetic effects.