According to most sources the kidney meridian has a complex series of trajectories. Once the meridian goes internal at the thigh, it passes to the spine at GV-1, then up the spine (an indefinite distance), back down the spine and out to KI-11. From KI-11 it superficially passes up to KI-16. At KI-16 an internal trajectory circles backward between the skin and the peritoneum, almost following the dai mai (girdle vessel) trajectory. The meridian then enters and permeates the kidneys. Then, passing downward through the ureter to the bladder, it spirally wraps the bladder. This path also passes out to CV-3 and CV-4.