It has been demonstrated that central Acetylcholine (ACh) plays a role inacupuncture analgesia. In order to study whether peripheral ACh involves inacupuncture analgesia and input of acupuncture information

some experimentswere performed. The results were as follows:1. Observation of histochemistry showed that at acupoints the nerve net-works in the corium

especially the free nerve endings and the nerves aroundarterioles as well as small branchs of nerves in subcutaneous tissue

were AChE