The three yin meridians of the hand start in the chest and run to the end of Fingers where they meet the three yang meridians of the hand. The three yang meridians of the hand start from the end of the fingers and ascend to the head where they meet the three yang meridians of the foot. The three yang meridians of the foot start from the head and run down to the toes where they meet the three yin meridians of the foot. The three yin meridians of the foot start from the toes and ascend to the abdomen and chest where they meet the three yin meridians of the hand. Thus, a closed yin and yang circuit is formed. The three yang meridians of the hand terminate at the head where the three yang meridians of the foot start. This reflects the ancient saying that "the head is the juncture of all the yang meridians".