The Arm Tai Yin Lung Meridian. It begins in the middle area of the body and runs down to the large intestine. Then it passes through the diaphragm to connect with the lungs. As with the other meridians, it branches out: one travels from the armpit and runs down the upper arms to the elbow crease. It then continues until the tip of the thumb, passing along the major artery of the wrist. The other branch appears from the back of the wrist and ends at the inner tip of the index finger connecting with the Large Intestine Meridian. This meridian is used for conditions of the throat, chest and lungs.