Which primary meridians pass through all three jiaos?

The primary meridians that pass through all three jiaos—upper, middle, and lower—are the pericardium and the san jiao meridians. The pericardium (PC) meridian is associated with the heart and circulatory functions, while the san jiao (SJ) meridian is linked to the regulation of the body's fluids and the distribution of qi throughout the body. Both of these meridians have pathways that traverse the various jiaos, reflecting their integral roles in connecting and influencing the upper, middle, and lower parts of the body.

This characteristic is crucial in traditional Chinese medicine because it highlights the holistic approach to treating conditions. By understanding how these meridians interact with all three jiaos, practitioners can address issues that may arise in different body areas stemming from a singular imbalance or blockage along these channels.