Known as the 'King's Bodyguard', the pericardium is the heart's protective sack. Although it is not recognized as an organ in Western physiology, it is regarded in Chinese medicine as a Fire-energy organ whose special function is to protect the heart. Not only does the pericardium provide the heart with physical protection, its energy also protects the heart from damage and disruption by excessive emotional energies generated by the other organs, such as anger from the liver, fear from the kidneys, and grief from the lungs. In the Chinese system of health, extreme outbursts of the Seven Emotions are regarded as powerful disruptors of internal energy balance and major causes of disease. Without the pericardium to protect it, the heart would be subject to injury from the radical fluctuations in energy caused by every emotional up and down of the day.
The pericardium also helps regulate circulation in the major blood vessels that run in and out of the heart. Emotionally, pericardium energy is related to the loving feelings associated with sex, thereby linking the physical and emotional aspects of sexual activity. It does this by moderating the raw sexual energy of the kidneys with the all embracing love generated by the heart.
Passage without points
The meridian originates from the chest emerges and enters its pertaining organ the pericardium then descends through the diaphragm to the abdomen connects successively with the upper, middle, and lower warmers known as triple warmer. The branch from PC 8 in the palm runs along the ring finger reaches its tip, where it links with the triple warmer meridian.
Passage with points
The branch arising from the chest runs transversely inside the chest emerges from the lateral chest (PC 1) ascends to the axilla following the medial aspect of the arm, runs downward between the lung and heart meridians passes through the cubital fossa goes further downward between the tendons of palmaris longus and flexor carpi radialis muscles enters the palm from there passes along the middle finger ends at its tip (PC 9).