《黄帝内经·素问·五藏生成》
各条脉络，都属于目，而诸髓都属于脑，诸筋都属于骨节，诸血都属于心，诸气都属于肺。同时，气血的运行则朝夕来往，不离于四肢八溪的部位。
诸脉者，皆属于目；诸髓者，皆属于脑；诸筋者，皆属于节；诸血者，皆属于心；诸气者，皆属于肺，此四肢八溪之朝夕也。
Each network belongs to the eyes. The marrow belongs to the brain. The tendons belong to the bones. The blood belongs to the heart. The qi belongs to the lung. Qi and blood circulate throughout the day and night and do not detach themselves from the limbs and the eight channels.