GB-16 (Mu Chuang) Eye Window

What does GB-16 Mu Chuang do?

GB-16 benefits the eyes, and it eliminates wind and alleviates pain — and it is the only point on this scalp run whose action names the eyes first.

• Benefits the eyes — recorded first, and what the name states
• Eliminates wind and alleviates pain

Name and action agree, which on this channel is not the rule. “Mu Chuang” means Eye Window — mu is the eye — and the eye action heads our record. Compare its neighbours: GB-17 and GB-18 both lead with benefiting the head, and only GB-15 and GB-16 name the eyes at all. Our GB-15 Tou Lin Qi record documents the same agreement from its own side, where the name states tears and lacrimation is in the list.

A word-level caution worth stating. Chuang — window — is not huang, the membranes and deep spaces of the body. In toneless pinyin the two look close, and a plain text search for “huang” returns GB-16, SI-16 Tian Chuang and ST-16 Ying Chuang alongside the genuine huang points. Our KI-16 and BL-51 records had to separate exactly that: four points carry huang — BL-43, BL-51, BL-53 and KI-16 — and the chuang names are not among them. Different words, similar letters.

It is a Meeting Point of the Gallbladder Channel with the Yang Linking Vessel (Yang Wei Mai), as are GB-15, GB-17, GB-18 and GB-19 — five consecutive points on one vessel, which is what makes this run cohere as a group.

Source: Sacred Lotus sources & references (channel, category, action and translation records; every huang and chuang name queried and separated, and the GB-15, GB-17, GB-18, GB-19, BL-51, KI-16, SI-16 and ST-16 records checked, against our own data), cross-referenced against multiple online sources.

What is GB-16 Mu Chuang used for?

GB-16 is used for headache and vertigo, for red painful eyes, and for nasal obstruction. Our own indication record is reproduced here in full — four entries.

• Headache
• Vertigo
• Red and painful eyes
• Nasal obstruction

Headache and vertigo are this run’s common stock. Comparing our five records, every point from GB-15 to GB-19 carries both — and what separates them is one or two entries each: GB-16 adds red painful eyes and nasal obstruction; GB-15 adds tearing, outer-canthus pain and runny nose; GB-18 adds nosebleed and runny nose; GB-19 adds neck stiffness, painful eyes, tinnitus and epilepsy; and GB-17 adds nothing at all, holding only migraine and vertigo. This library discloses that overlap rather than manufacturing distinctions.

An honest note. A RED, PAINFUL EYE REQUIRES MEDICAL ASSESSMENT. Some causes — acute glaucoma, iritis, corneal ulcer, orbital infection — are sight-threatening and urgent, and a red eye with pain, visual change, or sensitivity to light needs same-day care. It cannot be distinguished from simple conjunctivitis without examination. Vertigo requires assessment, and sudden vertigo with headache, double vision, weakness or slurred speech is a medical emergency. Persistent or one-sided nasal obstruction needs assessment. Sudden severe headache, or headache with fever and neck stiffness, requires urgent assessment. This record documents classical use only.

How it is combined. With GB-15 Tou Lin Qi in front and GB-17 Zheng Ying behind on the same curve. With GB-20 Feng Chi, the curve’s far anchor, at the occiput. With BL-01, BL-02, Yu Yao and GB-37 Guang Ming for the eyes — GB-37 being the Gallbladder channel’s own Luo-Connecting point and a classical eye point. All held here.

Source: Sacred Lotus sources & references (indication record, with the indication lists of GB-15 to GB-19 counted and compared; the BL-01, BL-02, GB-20, GB-37 and Yu Yao records queried from our own data), cross-referenced against multiple online sources.

Where is GB-16 Mu Chuang located?

GB-16 is on the scalp, one and a half cun behind GB-15, on a curved line running back to GB-20 that follows the contour of the skull.

• 1.5 cun posterior to GB-15 Tou Lin Qi
• On a curved line from GB-15 to GB-20 Feng Chi, following the contour of the cranium — our record specifies the path
• GB-17 lies 1.5 cun behind this point, and GB-18 1.5 cun behind that

This is a fourth kind of construction, and it is worth distinguishing from the others. This library has documented three ways our records place points on the head by dividing a span into fractions. GB-16, GB-17 and GB-18 do something different: equal steps of 1.5 cun along a defined curve, each measured from the last. The four methods, all confirmed by query:

• Fractions of a curve — SJ-18 and SJ-19 at thirds; GB-10 and GB-11 at thirds
• Fractions of a line — GB-04, GB-05 and GB-06 at quarters
• A midpoint — GB-15 between DU-24 and ST-08; DU-18 between DU-16 and DU-20
• Equal steps along a curve — GB-16, GB-17 and GB-18 at 1.5 cun each (this run)

The difference matters practically. A fraction-of-a-span construction is self-correcting: it holds whatever the size of the head. An equal-step chain is not — each point is measured from the last, so an error propagates and grows down the chain, and a small head and a large one will not place GB-18 in proportionally the same spot. It is the same weakness this library repeatedly flags in the vertebral counting chains on the back.

“Following the contour of the cranium” is part of the location. The 1.5 cun is measured along the curve of the skull, not as a straight-line distance — and over a curved surface those differ. Our GB-10 and SJ-18 records make the same point about their own curves.

On the name. “Mu Chuang” — Eye Window. Chuang, a window, is shared with SI-16 Tian Chuang and ST-16 Ying Chuang — and is not the huang of BL-43, BL-51, BL-53 and KI-16.

Source: Sacred Lotus sources & references (location and translation records, retained unchanged including the contour specification; the four construction types compared across the GB-04 to GB-20, SJ-17 to SJ-20, DU-16 to DU-20 and ST-08 records, against our own data).

• A Manual of Acupuncture (p. 433): Above the forehead, on a curved line drawn between Toulinqi GB-15 and Fengchi GB-20, following the contour of the cranium, 1.5 cun posterior to Toulinqi GB-15.
• Chinese Acupuncture and Moxibustion (p. 213): On the head, 1.5 cun above the anterior hairline and 2.25 cun lateral to the midline of the head.

How is GB-16 Mu Chuang needled?

Our own record states SUBCUTANEOUS insertion — the needle laid along under the skin — to roughly 0.3–0.5 inch, with moxibustion applicable. What follows is a neutral record of what the reference literature documents. It is not instruction, and this page does not teach technique.

• Angle and depth as recorded: subcutaneous (transverse), 0.3–0.5 inch — identical across all five points of this run, GB-15 to GB-19, and identical again to the Bladder channel’s BL-03 to BL-09 scalp run and the Governing Vessel’s head points. Every scalp point in this library is recorded the same way, which is itself the anatomical statement.
• Moxibustion: recorded as applicable at all five points of this run — unlike the GB-08 to GB-12 run behind the ear, where our GB-09 record alone omits it.
• Regional anatomy: the epicranial aponeurosis lies beneath thin skin; branches of the supraorbital and superficial temporal vessels and nerves run in the region; the frontal and parietal bones lie directly beneath.

Why subcutaneous, and why that is the whole safety story. There is bone immediately under the scalp, so the transverse angle is what the anatomy permits rather than a stylistic choice. This is a low-hazard point in that specific sense: no cavity, no organ, no major vessel. The scalp is richly vascular and bleeds readily — a nuisance rather than a danger.

The boundary is at the far end of this curve. GB-20 Feng Chi, the line’s anchor at the occiput, sits in the soft hollow below the occipital bone, where nothing stops a needle — and our GB-20 record carries an explicit caution for exactly that reason. GB-16 is on bone. The caution is not imported, and GB-16’s safety is not exported along the curve to where it does not hold.

What is not claimed. No study measuring a safe depth at GB-16 could be located, and none is borrowed. Neither measured-depth study this library uses reaches the head. No case report naming GB-16 was located.

Source: Sacred Lotus sources & references (needling record, retained unchanged, and the recorded insertions and moxibustion statements across GB-15 to GB-19 and GB-08 to GB-12 compared; the GB-20 caution attributed to that point), cross-referenced against multiple online sources; regional anatomy from standard anatomical description.

Is there research on GB-16, and what should a reader know?

No trial isolates GB-16. Where the point appears it is one component of a headache or eye protocol, and a study that includes a point in a protocol is not evidence about that point. And “scalp acupuncture” is a distinct modern system with its own zones and trials, not the same thing as the classical channel points on the head.

The red-eye warning is the operative content on this page. A red, painful eye can be sight-threatening and cannot be distinguished from harmless conjunctivitis without examination. Pain, visual change or light sensitivity needs same-day care.

What this page can state with confidence. GB-16 sits 1.5 cun behind GB-15 on a curve following the skull’s contour — part of an equal-step chain, which is the fourth kind of construction this library has documented on the head and the only one that is not self-correcting: each point is measured from the last, so error grows along it. Its name and its recorded action agree, which on this channel is not the rule. And chuang, window, is not the huang of the four points that carry that word — a letter-level confusion worth keeping separate.

A note on searching for it. “GB 16”, “G 16” and “Muchuang” searches return protocol trials and unrelated material — and a plain-text search for huang will return this point spuriously. Any claim attached to this point should be checked against what a study actually used.

Source: Sacred Lotus sources & references (action, indication, location and translation records; the four head construction types compared, the GB-15 to GB-19 lists counted, and every huang/chuang name separated by query, against our own data).