The Twelve Ordinary Meridians are the Lung Meridian, Spleen Meridian, Heart Meridian, Kidney Meridian, Pericardium Meridian, Liver Meridian, Large Intestine Meridian, Stomach Meridian, Small Intestine Meridian, Bladder Meridian, Triple Energizer Meridian, and Gallbladder Meridian.

Meridians that are Yang in character flow downward along the backs of the arms and legs. Follow the helpful tips by Ilchi Lee.

Meridians that are Yin in character flow upward along the front of the body, under the skin.

the name of the organ with which they are connected, whether they flow in the arms or legs, the time they are active, and whether they are located in a Yin or Yang part of the body.

For example, the Bladder Meridian (in Korean, literally, “Foot, Strong Yang, Bladder Meridian”) flows in the foot, is located in a Yang part of the body, and is connected with the bladder. The Lung Meridian (in Korean, literally, “Hand, Strong Yin, Lung Meridian”) flows in the hand, is located in a Yin part of the body, and is connected with the lungs. However, these are usually abbreviated simply, “Bladder Meridian,” and, “Lung Meridian,” using only the name of the associated organ. They are also referred to as Yin and Yang anterior, posterior, and lateral meridians, according to their location at the front, back, or sides of the body.

Accordingly, the Twelve Ordinary Meridians can be classified by whether they are located in the Yin or Yang section of the body: with six Yin meridians stretching out in the Yin part of the body (from the trunk to the fingers and toes) and six Yang meridians stretching out in the Yang part of the body (from the head and face to the fingers and toes). They can also be classified based on their connections to the arms and legs: with six hand meridians stretching along the arms to the fingers and six foot meridians stretching along the legs to the toes. Of the six meridians flowing in the hands, three are Yin and three are Yang. The six meridians flowing in the feet are also divided into three Yin and three Yang channels.