The Basic Principles Behind TCM(中医基础原理之经络)

Meridians
Meridians or channels form a distribution system that carries Qi, Jing, Blood and Body Fluids around the body.
There are 12 main meridians. Branching from them is a network of other smaller channels. Each main meridian is connected to one of the twelve organs and travels along its own route within the body. For example, the Heart meridian travels in a pathway from the heart itself to the armpit and down the inside of the arm to the little finger. This explains why someone with a heart problem often has a tingling feeling running down the arm to the little finger.