Twinty-nine rabbits were used.The spindle

tendon organ

light and hea-vy pressure receptors in medial gastrocnemius muscle were identified by reco-rding discharges of single afferent fiber in medial gastrocne mius nerve fromfine filaments by dissection.The discharge patterns of the receptors respon-ding to the manipulations

i.c.lift and thrunst

twist and twirl

rotate

scra-pe flick the needle and finger-pressure were observed.Data at 85 units werecollected totally.Every type of deep receptor can react to any manipulation.The dischargepatterns of different receptors were alike when stimulated with same manipu-lation

but there were different patterns while varying manipulations actingon the same receptor.These are due to the movement forms

the force amo-unt

the time duration of the manipulations.All these facts are nearly thesame as in cutaneous receptors.Acupuncture effect on deep receptors was not limited to one point butwithin a certain area

namely distant effect existed.The area size variedfrom receptor to receptor and from manipulation to manipulation.Because of the distant effect on receptors by acupuncture

and the loseof responsibility in units when receptor destroyed

we suggest that effectiveacupuncture stimulation is induced mainly due to the receptor deformation

whichis caused by the stress from pressure

stretch and vibration of acupuncture.In view of the needling sensation is closely related to the curativeeffects

the receptors dealing with needling sensation are analysed according tothis series works and other facts

we further advance the opinion that the re-ceptors of deep pain are the chief material foundation to induce the sensationof hand needling.