There are six meridians that travel through the legs: the Foot Convulsive Yin Liver Meridian, the Foot Tai Yin Spleen Meridian, the Foot Solar Bladder Meridian, the Foot Yang Ming Stomach Meridian, the Foot Shao Yang Gallbladder Meridian and the Foot Shao Yin Kidney Meridian. Each meridian travels differently, with interaction between meridians and meridians, but most of them follow their own fixed lines of travel, such as the foot solar bladder meridian, which branches out from the top of the head, a meridian that travels both sides of the spine to reach the waist, and a meridian that branches out from the waist to reach the buttocks to reach the lower extremities. Other meridians also have their own unique circuit, which can be studied with the aid of pictures. Western medicine does not yet have a comprehensive understanding of meridians and has not yet studied why they can cure diseases.