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Alternate names: 中空 zhōng kōng, Central Hole

Channel: BL, Foot Greater Yáng (tài yáng) Bladder Channel

Modern location: An acupoint located on the sacrum, in the third sacral foramen.

Classic location: In the third opening, in the depression on either side of the spine. (Zhēn Jiǔ Dà Chéng)

Local anatomy: Posterior branches of the lateral sacral artery and vein. The course of the posterior ramus of the 3rd sacral nerve.

Action: Frees the channels and quickens the blood; disperses cold and relieves pain; regulates the menses and checks vaginal discharge.

Modern indications: Constipation; diarrhea; menstrual irregularities; vaginal discharge; lumbar pain.

Classic indications: Red and white vaginal discharge; strangury-turbidity (lìn zhuó); abdominal distension and diarrhea; food diarrhea; the five taxations and the damage by the seven affects.

Needle stimulus: Needling: 0.7‒1.0 cùn perpendicular insertion. Moxa: 3‒7 cones; pole 20‒30 min.

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