The character for Dai relates to a girdle with trinkets hanging off it. It is symbolic of arranging, controlling and holding in place.
The function of the Dai Mai is to bind and unify the extraordinary vessels. It is the only vessel to cut horizontally through the body. It is the entire cross section of the body at this point.
It connects to all the vessels as they go through the abdominal region. It connects with the vital centre (and ming men or the fires of destiny) and links the Du, Ren and Chong around the vital region. It regulates the animation and movement of the vessels as they move through the abdomen. It also balances the yin and yang in the leg because all six leg channels cross it.
The Dai Mai acts like a pivot, ensuring there is regular circulation between the upper and lower parts of the body. It holds and suspends, which affects circulation, ensuring well balanced pressure, and a balance between relaxation and tightness. The Dai Mai acts like a belt around the body, and like a belt it is important for it to be neither too tight nor too loose.
The Dai Mai starts at the edge of the ribs at Lv13, and then passes through GB26, 27, 28. It connects to Du4 and Bl23.
Used for abdominal region, nourishes gall bladder with jing qi from the Kidneys, general pain, pain in the limbs, headaches, circulation in the legs, reproductive system, tension at the back of the neck, hip conditions, lumbar pain, fullness and looseness of the abdomen with a feeling like you are sitting in cold water, muscles numb, muscles trembling, painful and swollen extremities, arthritis, chronic diseases, tinnitus, extremities difficult to hold up.