You can see the meridian system as pathways of energy in your body. There are 14 meridians, named after the function they’re connected with. That’s in most cases the name of an organ.
Twelve of the meridians are actually one large energy pathway that surfaces twelve times. The remaining 2 meridians are special meridians, as they’re also radiant circuits at the same time:
Central and Governing.
Here are the other twelve meridians and the time period when they are at their peak: