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

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

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

Local anatomy: The posterior branches of the lateral sacral artery and vein. The lateral branch of the posterior ramus of the 1st sacral nerve.

Action: Rectifies the small intestine; transforms stagnation and accumulation; promotes the separation of the clear and turbid; regulates the bladder.

Modern indications: Abdominal pain; diarrhea; dysentery; enuresis; bloody urine; hemorrhoids; seminal emission; vaginal discharge; lumbar pain.

Classic indications: hemorrhoids; mounting qì (shàn qì, inguinal hernia); reddish urine; dry mouth; vaginal discharge; swelling of the feet; heart vexation.

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

Needle sensation: Distension and numbness often spreading downward and outward.

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

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