The channel system, counted

A river system is easier to hold in the head than a list of rivers. You learn that water runs downhill, that tributaries join trunks, that a confluence is a place worth building a town. After that the individual names are detail. The channel system works the same way: fourteen routes across the body, each with a direction and a set of stops, and once the shape is there the point codes stop being arbitrary.

The fourteen

Twelve channels are paired with organs and run in yin and yang pairs along the limbs. Two more, the Conception and Governing vessels, run up the midline front and back. Between them they carry 361 points, which is the number the classical catalogue settles on and the number the WHO nomenclature fixed a code for in 1991.

The distribution is lopsided by design rather than by accident. The Bladder channel carries 67 points and runs the length of the body, down both sides of the spine, where it collects the back-shu points. The Heart and Pericardium channels carry nine each and spend eight of them on the arm: each begins on the trunk, at HT01 in the armpit and PC01 beside the nipple, and runs from there to a fingertip. A channel’s point count tracks how much territory it crosses, not how much it matters.

The 412 outside

The channels are not the whole catalogue. AcuiQ indexes 773 points, and 412 of them sit outside the fourteen.

The two at the bottom are different in kind, not merely in location. Auricular points map the whole body onto the outer ear, so the ear is a second coordinate system laid over the first, and it does not borrow the first one’s codes. Its prefixes name parts of the ear rather than channels or regions of the body: the helix, the antihelix and its two crura, the tragus and antitragus, the scapha, the triangular fossa, the two halves of the concha, the lobe and the back of the ear. The scalp lines are lines rather than points, drawn over cortical projection areas and needled along their length. Both were formalised in the twentieth century, which is why their numbering is the part of the catalogue that agrees with itself least. The 1991 nomenclature covers the scalp lines and not the ear at all, and what happened next is the subject of Reading a point code.

What the count is good for

361 is a small number for a body. It is also the number every published prescription draws from, which is what makes a corpus of prescriptions tractable at all: the vocabulary is fixed and short, so the same point recurs across thousands of papers and can be counted. AcuiQ’s whole method rests on that property. A field where every practitioner named their own points would produce a literature you could read but never aggregate.

The channels are the reason the vocabulary stayed short. They are a filing system that predates the filing problem, and they have outlasted every attempt to replace them.