1. The concept of the four seas is the place where all rivers meet, and any huge meeting place can be called the sea. In the meridian theory, it is believed that the twelve meridians runs qi and blood, just like water flowing on the earth, so it is called the twelve meridians water. The qi and blood prevailing in the Twelve Classics is like a hundred rivers finally merging into the sea, thus forming the concept of the sea. The four seas are the general name of human marrow sea, qi sea, water valley sea and blood sea, and are the four parts of the twelve meridians's qi and blood from generation, differentiation to convergence. 2. The content of the four seas is similar to the division of Qi Street. "LingShu? At sea, the stomach, pulse, stomach and brain are called the sea of water valley, the sea of blood, the sea of qi and the sea of marrow respectively, and it is pointed out that there are different acupuncture points for infusion in the four seas. " Uncle ling? The article "On the Sea" says: The stomach is the sea of water valley, and it is lost in Qi Jie (Qi Chong point) and down to Li San; The pulse-rushing person is the sea of the twelve meridians. If you lose it in the rafters, you will lose it. Those in the mountains are the sea of qi, lost in the column bones, and greeted by people before; The brain is the marrow sea, lost in the cover and lost in the wind room. The upper and lower column bones refer to the neck; The loss of marrow sea lies in the cover, which refers to Baihui point on the top of the head. The specific parts of the four seas are: the marrow sea is in the brain; The sea of qi is in the middle of the chest; The sea of water valley is in the upper stomach and abdomen; The sea of blood (also called the Sea of the twelve meridians) is in the lower abdomen of the pulse. In addition, the four seas also have their own infusion points. 3. The meridians on the surface of the four seas and perfusion points are composed of meridians, collaterals and numerous sun collaterals and floating collaterals. When the qi and blood running in the meridians come together, the four seas are formed, and their * * * channels in the head, chest, abdomen and tibia are qi streets. The parts of Sihai and Seventh Street are also the same. The brain is the medullary sea, located in the head and connected with the head gas street; The mountain is a sea of gas, located in the chest and connected with the chest gas street; The stomach is the sea of water valley, which is in the upper abdomen and communicates with the abdominal qi street; The pulse is a sea of blood, located in the lower abdomen, communicating with the abdominal qi street and the tibial qi street. Therefore, the four points in the meridians are consistent with the qi street, root knot and knot mark of the specimen, and their theories can cooperate with each other to explain the segmented relationship of head, chest, upper and lower abdomen and tibia. In particular, the division of chest, upper abdomen and lower abdomen is consistent with the division of triple energizer into upper, middle and lower, which is of special significance to the division of acupoints. 4. Comparison Table of Four Seas, Qi Jie and Sanjiao Districts 5. The application of the Four Seas Theory is of great significance to the interpretation of human physiology and the diagnosis and treatment of diseases. The brain is called the marrow sea, which has something in common with the spiritual wisdom hall of the leader and the Yuan Temple called by later generations. In other words, the heart is the supreme master of the spirit and the source of air. The meridians directly related to the brain are Du Meridian and Foot Sun, and then expand into three yang of hand, foot and foot. Yang Qi is based on the marrow sea. "LingShu? The theory of the sea says: the marrow of the sea is more than enough, then it is light and strong, then it is more than enough; Insufficient medullary sea leads to brain rotation, tinnitus, shin pain, dizziness, blindness, slack, and eye closure. Symptoms of deficiency and excess in medullary sea can be treated through relevant acupoints. Zhongshan is called the sea of qi, which refers to the gap between the heart and lungs, where the qi of ancestors gathers and belongs to the upper energizer. Through cardiopulmonary breathing, the qi of ying Wei runs through the whole body. Its surface is the chest and back, which is most closely related to the three yin meridians of the hand. " Uncle ling? Sea theory says: those who have more than enough gas in the sea are full of gas in their chests and blush when they rest; If there is not enough gas in the sea, then there is not enough gas. Symptoms of deficiency and excess can be treated through relevant acupoints. The stomach is called the sea of water valley, which means that the stomach is responsible for receiving Shui Gu and transforming its essence into middle energizer. It is the source of Wei Ying and qi and blood, and is endowed by the five internal organs, so it is also called the sea of five internal organs. The meridian is located in the upper abdomen, which is the stomach meridian of the foot Yangming, with the most abundant qi and blood.