[Discussion on the Qi-passage of meridian-collateral system]

The author of the present paper holds that "Qi-passage" is in fact the essence of meridian-collateral system in the human body. In my opinion, the so called "Jing" of the fourteen meridians is referred to the tissue structure of the longitudinal fascia space; the so called "Luo" of the fifteen collaterals referred to the tissue structure of the transversal fascia space, and the "Mai" of meridians and collaterals referred to tissue liquid-Qi of both longitudinal and transversal fascia space. The "Dao" (Qi-passage) of meridians and collaterals is the tissue structure of both longitudinal and transversal fascia space. The tissue liquid-Qi and tissue structure depend on each other. The doctrine of "Qi-passage" of meridian-collateral system has its original evidence, scientific and substantive basis. The meridian-collateral system is a regulative and control system of the unknown synthetic functions of multiple substances including loose connective tissue, tissue liquid-Qi, energy substances, nerves, blood vessels and lymph, etc..