Sanjiao is one of the six viscera, which is located in the cavity between the human body and the viscera, including the thoracic cavity and abdominal cavity, in which other viscera and organs of the human body are located. It is a general term for upper jiao, middle jiao and lower jiao, that is, the trunk is divided into three parts, and the viscera above the diaphragm are upper jiao, including the heart and lungs; The viscera from the diaphragm to the umbilicus is the middle jiao, including spleen, stomach, liver, gallbladder and other viscera; The viscera below the umbilicus is the lower jiao, including kidney, large intestine, small intestine and bladder.

Generally speaking, the triple energizer is the upper energizer in the chest above the diaphragm, including the heart, lungs, head and face; From diaphragm to navel, it is an intermediate lesion, including spleen, stomach and stomach meridian. The umbilicus down to the second yin is the lower jiao, including liver and kidney, large intestine and bladder meridian. Among them, the liver, according to its location, should be classified as the middle jiao, but because of its close relationship with the kidney, the liver and kidney are classified as the lower jiao together. The function of triple energizer is actually the sum of all the functions of the internal organs.

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