“Tunneling” Among the Five Zang: Why Can the Heart Communicate with the Gallbladder, Stomach, Sanjiao, Bladder, and Large Intestine?

Conventional zang-fu pairing easily brings to mind fixed tables such as Heart–Small Intestine and Lung–Large Intestine. “Kuidu (II),” however, lists a clearly more complex set of relations.

The text first gives:

Heart communicates with Gallbladder; Lung with Bladder; Spleen with Sanjiao; Kidney with Stomach; Liver with Large Intestine; Bao-network with Small Intestine.

It then lists many additional groups—Heart with Stomach, Heart with Sanjiao, Heart with Bladder, Heart with Large Intestine, and so on—while Lung, Spleen, Kidney, Liver, and Bao-network are each paired with different fu in other configurations.

The passage concludes:

These are all the measures of the tunneling of the Five Zang: qi interaction keeps its governing offices, and joint meetings communicate with one another.

“Tunneling” is not a fixed exterior-interior pairing

If one zang could permanently couple only with one fu, there would be no reason to list so many different combinations.

This passage shows that the Mirror Classic is describing a coupling network that changes according to the position of qi interaction.

The same Heart, at different She positions or different stages of qi transformation, can therefore form different governing-response relations with Gallbladder, Stomach, Sanjiao, Bladder, Large Intestine, and other fu.

Zang-fu relations are dynamic

This is fully consistent with the earlier Eight She and the distinction between proper position and response position. Zang-fu are not isolated organs with only one fixed wire between each pair. Through channels, streams and valleys, and joint meetings, different relations form at different phases.

The word “tunneling” itself conveys dynamic penetration and opening of passage.

This passage should not be rewritten directly as a modern anatomical correspondence

The source says that these relationships arise through qi-interaction governance and communication at joint meetings. It does not provide proof that they correspond to specific modern nerves, blood vessels, or fascial pathways.

The most appropriate first reading is therefore to treat this section as a functional coupling codebook of the Mirror Classic, leaving future experiments to test whether reproducible physiological correlates can be observed.

The Six Channels also have separation and joining rather than permanent attachment

The same passage says that the Three Yang and Three Yin, and pairings such as Yangming-Shaoyang, Shaoyin-Taiyin, and Taiyang-Jueyin, can separate and call one another into relation. This reinforces the idea of a dynamic network: relations can separate and can also recombine.

The next article examines how this network is assigned concrete depths and observation-retention times.