The small intestine, located in the abdomen, is one of the six fu-organs. Its upper opening is connected with the stomach at the pylorus, and its lower one is connected with the large intestine at the ileocolic opening. The small intestine is a long, winding, and zigzagging tract divided into the duodenum, jejunum, and ileum. It plays an important role in digestion, absorption, and waste disposal, whose function is to receive the chyme and transform it, and to separate purified nutrients from turbid wastes. The Small Intestine Meridian of Hand-taiyang has an exterior-interior relationship with the Heart Meridian of Hand-shaoyin.