The coursing and connecting law of the twelve meridiansis is: the three yin meridians of the hand travel from the chest to the end of the fingers where they connect with the three yang meridians of the hand; the three yang meridians of the hand go up from the end of the fingers to the head on which they connect with the three yang meridians of the foot; the three yang meridians of the foot descend from the head to the the end of toes where they join the three yin meridians of the foot; the three yin meridians of the foot ascend from the toes to the abdomen and chest in which they meet the three yin meridians of the hand. Thus, the twelve meridians are connected with each other, forming a circle- like pathway along which yin and yang smoothly circulate without terminus. See the following diagram.

Fig.1 Fowing direction and Connecting Law of the Twelve Meridians

It is clearly seen from fig.1 that the three yang meridians of the head terminate at the head from which the three yang meridians of the foot start. The three yang meridians of the hand and the foot meet at the head So, TCM says: "The head is the junction of all yang meridians".

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