Purpose: The referred pain of the somatic structure, a response of the visceralgia, is often seen in clinic. But its underlying mechanisms are poorly understood. It is interested that cardiac referred pain often appears along the running course of the Heart Meridian (HM), while acupuncture of the acupoints of HM can effectively relieve cardiac pain. In the present study, the neural basis of the relationship among the HM, cardiac referred pain and the heart is investigated by using tri-labeling technique.
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