Human veins, how to distinguish meridians?

Meridian is the general name of "meridian" and "collaterals", including meridian and collaterals. "Meridian" is a meridian with path significance and a longitudinal trunk part of the meridian system; "Collateral" means collateral, which means network, criss-crossing, covering the whole body, and is a branch of the meridian system. Although there are differences between meridians, their circulation distribution is closely related and interrelated. The article "Lingshu Zangfu Disease Syndrome" says: "the twelve meridians, 365 collaterals." The chapter "Lingshu Jing" says: "The meridians are inward, the branches are horizontal, and the rest are sun ..." The meridians are deeply distributed and invisible, while the collaterals are shallow and often visible. "Lingshu Jing" says: "Meridians are often invisible"; "Both the floating pulse and the tong pulse are collaterals."

Jingxing-Yushu Meridian is five special acupoints in the twelve meridians, from limbs to elbows and knees, which are collectively called Five Shu points. Ancient physicians vividly compared the movement of qi and blood in human body with the movement of natural water. For example, "The Nine Needles and Twelve Origins of Lingshu" points out: "Keep it as a well, slide it for prosperity, note it as a loss, do it as a classics, enter it as a combination, and all the actions are lost in five." That is to say, the place where pulse gas speaks is called well, the place where pulse gas just started to be as popular as running water is called Xing, the place where pulse gas gradually flows to the depths is called Losing, the place where pulse gas flows rapidly is called Jing, and the place where pulse gas converges is called He. The qi of the meridians of the twelve meridians and the Tenth Five Meridians is combined into twenty-seven qi, and the places where the twenty-seven qi enters, flows and runs are all in these five acupoints-Jing, Xing, Shu, Jing and He.