The 12 main meridians

• The 12 main meridians connect internal organs (Zang-Fu) with the body surface.
• Qi flows sequentially through the meridians in a 24-hour cycle (organ clock).
• Each meridian has a 2-hour peak activity window.
• Acupuncture points are gateways to Qi along the pathway.
• Blockage in a meridian causes pain along its course; deficiency causes weakness.
• Yin meridians run along the anterior and inner body; Yang along the posterior and outer.

Introductory guide: what meridians are.