The twelve principal meridiansLesson 1 of 4 · Reading · 16 min

Three arm Yin, three arm Yang, three leg Yang, three leg Yin

Yin meridians run chest to hand (Lung, Pericardium, Heart) and foot to abdomen (Spleen, Liver, Kidney); Yang meridians run hand to head (Large Intestine, San Jiao, Small Intestine) and head to foot (Stomach, Gallbladder, Bladder).

The organ clock

Each meridian has a two-hour peak; it starts with the Lung (3–5 am).