GB-32 (Zhong Du) Central River

What does GB-32 Zhong Du do?

GB-32 expels wind, damp and cold, and activates the channel to alleviate pain — a local thigh point on the outer thigh, used for the leg.

• Expels wind, damp and cold — the three external factors that lodge in the joints and channels to cause the aching, heavy, cold bi (painful obstruction) patterns
• Activates the channel and alleviates pain — the local and channel action for the thigh and leg

A local leg point. Both recorded actions and every indication concern the thigh and lower limb — GB-32 is a channel point for the leg, not a systemic point. It sits on the outer thigh two cun below GB-31 Feng Shi (“Wind Market”), and shares that point’s wind-and-damp, leg-focused character; the two are used together for the lateral thigh and for numbness and weakness of the leg.

A name collision — and a classification difference too. There are two points called Zhong Du in our data, and they differ in more than location: GB-32 Zhong Du, Central River, here on the Gall Bladder channel on the thigh, carrying no special classification — and LIV-06 Zhong Du, Central Metropolis, on the Liver channel on the lower leg, which is the Xi-Cleft point of the Liver. Same pinyin, different Chinese characters for du (river vs capital/metropolis), different channel, different classification. A reference to “Zhong Du” must say which.

On the name. “Zhong Du” here means Central River — zhong central, du a large river or watercourse. The reading ties it to the point’s position in the channel’s course down the outer thigh.

Source: Sacred Lotus sources & references (channel, action and translation records; both Zhong Du points — GB-32 and LIV-06 — and the GB-31 record queried against our own data), cross-referenced against multiple online sources.

What is GB-32 Zhong Du used for?

GB-32 is used for pain and soreness of the thigh and knee, numbness and weakness of the lower limbs, and hemiplegia. Our own indication record is reproduced here in full.

• Pain and soreness of the thigh and knee
• Numbness and weakness of the lower limbs
• Hemiplegia (one-sided paralysis)

All of the leg. Thigh-and-knee pain and lower-limb numbness and weakness are the local channel action; hemiplegia — one-sided paralysis, classically a sequel of wind-stroke — is the entry that reaches beyond the local, GB-32 appearing in leg-rehabilitation combinations for the affected side.

An honest note. Hemiplegia is a major neurological sign — a new one-sided weakness is a stroke until proven otherwise and is a medical emergency requiring immediate care (“time is brain”). Where acupuncture has a role it is in rehabilitation, alongside medical stroke care, never in place of emergency treatment. New numbness or weakness of a leg requires assessment. This record documents classical use only.

How it is combined. With GB-31 Feng Shi just above and GB-34 Yang Ling Quan below the knee — the outer-leg Gall Bladder points — and with GB-30 Huan Tiao at the hip for the lower limb. All held here.

Source: Sacred Lotus sources & references (indication and action records; the GB-30, GB-31 and GB-34 records queried from our own data), cross-referenced against multiple online sources.

Where is GB-32 Zhong Du located?

GB-32 is on the outer thigh, two cun below GB-31, five cun above the back of the knee, in the groove between two thigh muscles.

• 2 cun below GB-31 Feng Shi on the lateral (outer) thigh
• 5 cun above the popliteal crease (the crease behind the knee)
• Between vastus lateralis and biceps femoris — the groove between the outer quadriceps and the hamstring

Found from GB-31 and the muscle groove. GB-31 Feng Shi is famously located where the middle fingertip touches the thigh when the arm hangs straight down; GB-32 sits two cun below it, in the groove between the outer thigh muscles. Both landmarks — the distance from GB-31 and the palpable inter-muscular groove — fix it.

On the name. “Zhong Du” — Central River, and not to be confused with LIV-06 Zhong Du (Central Metropolis) on the lower leg, as noted above.

Source: Sacred Lotus sources & references (location and translation records, retained unchanged; the GB-31 record queried from our own data).

• A Manual of Acupuncture (p. 449): On the lateral aspect of the thigh, 2 cun inferior to Fengshi GB-31.
• Chinese Acupuncture and Moxibustion (p. 218): On the lateral aspect of the thigh, 2 cun below Fengshi (GB-31), or 5 cun above the transverse popliteal crease, between m. vastus lateralis and m. biceps femoris.

How is GB-32 Zhong Du needled?

Our own record states perpendicular insertion of 0.7–1.0 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: perpendicular, 0.7–1.0 inch, into the thigh muscle.
• Moxibustion: recorded as applicable.
• Regional anatomy: the point lies between vastus lateralis and biceps femoris on the outer thigh; muscular branches of the femoral and sciatic nerves supply the region; the femur lies deep.

Hazard, stated proportionately. This is a low-hazard point: no body cavity, no pleura, no organ, thick muscle over bone. Our record carries no arterial caution at GB-32, and it is not among the nine points that do. The thigh tolerates the recorded depth without special concern.

What is not claimed. No study measuring a safe depth at GB-32 could be located, and none is borrowed. No case report naming GB-32 was located.

Source: Sacred Lotus sources & references (needling record, retained unchanged; the nine arterial cautions queried from our own data), cross-referenced against multiple online sources; regional anatomy from standard anatomical description.

Is there research on GB-32, and what should a reader know?

No trial isolates GB-32. Where the point appears it is one component of a leg or stroke-rehabilitation protocol, and a study that includes a point in a protocol is not evidence about that point.

What this page can state with confidence. GB-32 Zhong Du (“Central River”) is a local thigh point of the Gall Bladder channel — it expels wind, damp and cold and activates the channel, and all its indications concern the leg. It sits on the outer thigh 2 cun below GB-31. It is one half of a genuine name collision: GB-32 Zhong Du (Central River, no classification) is a different point from LIV-06 Zhong Du (Central Metropolis, the Liver’s Xi-Cleft) — differing in channel and classification, not just location.

A note on searching for it. “GB 32”, “G 32” and “Zhongdu” searches are actively ambiguous — “Zhong Du” names two different acupuncture points (GB-32 and LIV-06), and matches place names besides. Any claim attached to “Zhong Du” must be checked against which of the two a source means.

Source: Sacred Lotus sources & references (action, indication and location records; both Zhong Du points and the GB-31 record queried, against our own data).