INTRODUCTION
Triple energizer theory originated from the oldest Chinese medical book “Yellow Emperor’s Canon of Medicine (YECM)” [1]. It is an extremely important concept in traditional Chinese medicine (TCM), and is known to participate in the comprehensive regulation of visceral function, but its physical and anatomical basis is still elusive for more than 2000 years. YECM usually classifies triple energizer into upper, middle and lower parts according to their functions, without reference to their intrinsic morphology and structure. The upper part completes the function of the chest viscera, including the heart and lungs; the middle part completes the visceral function of the abdomen above the umbilicus, including the stomach, spleen, liver, gallbladder, pancreas and small intestine; and the lower part completes the visceral function of the abdomen and pelvic cavity under the umbilicus, including kidney and bladder. Limbs and head were excluded from the range of triple energizer. After analyzing the triple energizer theory put forward by YECM,Yellow Emperor’s Eighty-one Hard Canon (YEEHC) also proposed that triple energizer has a name without a structure. Although this view has been controversial, it has become the mainstream [2].