据报道P物质(SP)在脑内具有镇痛作用

但这些资料多数是将外源性SP注入脑内而得出的结论。虽然在针刺镇痛过程中脑、脊髓内SP含量具有明显的变化。然而

在实用一些递质或某些镇痛物后

脑This invcsligation was pcrformcd with thirty adult rabbits which dividcd auricular vagus

great auricular

cervical sympathcric and all auricular denervation.By gastrointestinal electro-physiologic methods

the changes of gastroiutestihal electric activity in corpus

antrum

dudenum and colon were observed with ear needing to evaluate the mechanism of function of auricular point. Results: In intact car innervation

the changes of gastrointestinal electric activity on car needling were obvious (P<0.05—0.01). While the one with car nerve sected showed that influence of ear acupuncture still remaincd

but when the whole auricle was dencrvatcd the influcnce of car needling on gastrointestinal electric activity obvicusly deceased or disappeared

pre-and post needing the changes on gastrointestinal electric activity were not statistically different (P>0.05). Recordings at the four parts of digestive tract gave similar rcsults in frequancy

amplitude

inotility index

action area integral. Exerting stimulation on gastric vagus or sympathetic nerves could bring about double phase modulatory (excitory or inhibitory). The above revealed that the functions of car point in diaghosis and therapy is not due to one kind of nerves in periphery. The functions of ear point at innervation may be in its entirety. It was rcportcd that function of car points has something to do with auricular vagus or ret auricular or sympathetic nerves

but

this is only one side of the matter. Moreover

since auricular point are associated with various propagatal tracts and with modulation of nerve centers

their mechanism is very complicated and needs to be further studies.