Basic on the characteristics and functions, TCM classified all organs in human body in to Yin-Yang and five elements systems, and leading by five zang organs: liver, heart, spleen, lung, kidney.

The connections in those organs and allover the body called medians and collaterals, as noted earler, chi movers in cycles timed by natural phenomena, and it circulates within the human body through those network, on those network, lie a place which can regulate chi called acupoints. The most common way of naming networks is for the organ with which they are associated, since each network sends a deep branch of Chi flow into solid Yin or hollow Yang organ.Thus, the networks are called couples, such as heart and small intestine and so on. Another way of classifying is divides it into 6 great divisions,according to where in the cycle of Yin-Yang they are active. and upper/lower portions( organ and associated). There are 12 primary meridians, 15 collaterals, and 8 extra meridians.

When contemplating the use of the networks to treat a patient, generally consider the areas of the body that the networks traverse, the Yin-Yang characteristics, and the functions of the organs to which each networks homes.

The organ system and its networks perform complex bodily functions. Every organ system has its own unique function. TCM use concepts of Chi (Life Force), Yue (Blood), Jin (Moisture), Ye (Bodily Fluid) to understand the human body and considers Jing (Essence of material based), Chi, Shen (Sprit) as the treasures of life. TCM views the body as energetic systems in dynamic balance. Chi flows in patterns through meridians & collaterals (networks) to all parts of the body. Any disturbance of this harmony, such as harmful substances or intense emotions, may result in illnesses. Diseases become apparent when the body is unable to cope with the disturbance of the Chi flow.