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

Modern location: An acupoint located on the sacrum, level with the second sacral foramen, 1.5 cùn lateral to the midline.

Classic location: One cùn and five fēn either side of the spine, below the nineteenth vertebra. The point is found in prostrate posture. (Zhēn Jiǔ Dà Chéng)

Local anatomy: Posterior branches of the lateral sacral artery and vein. Lateral branches of the posterior rami of the 1st and 2nd sacral nerves.

Action: Regulates the bladder; perfuses the lower burner; disinhibits the lumbus; dispels wind-dampness; supplements the lower origin.

Modern indications: Inhibited urination; enuresis; diarrhea; constipation; painful stiffness of the lumbar vertebrae.

Classic indications: Wind patterns; vacuity taxation; semen in the urine; hard binds, accumulations, and gatherings; genital sores or swelling; strangury-turbidity (lìn zhuó); rough urination with reddish urine; cold and weakness in the knee and lower leg; abdominal fullness; difficult defecation; cold and hypertonicity of the lower leg preventing bending and stretching; scantness of breath; female conglomerations and gatherings; nontransformation of grain and water due to spleen vacuity.

Needle stimulus: Needling: 0.5‒1.0 cùn perpendicular insertion. Moxa: 3‒7 cones; pole 20‒30 min.

Needle sensation: Distension and numbness, sometimes spreading over the buttocks.

Point groups: Transport point (shù xué) of the bladder.

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