摘要
Our previous studies have shown that the nucleus raphe magnus and its adjacent ventromedial reticular formation in the medulla oblongata is able to exert a descending inhibitory effect on the transmission of visceral pain signals in the spinal cord and play an active part in acupunctural analgesia(1-3)The available evidences indicate that the central tegmental tract（TTC）[4,5] and periaqueductal grey（Gcm）[6-8] in the midbrain and the nucleus centrum medianum（CN） in the thalamus are involved in
