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Alternate names: BL-47

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

Modern location: An acupoint located on the lower back, level with the inferior border of the spinous process of the second lumbar vertebra, 3 cùn lateral to the midline.

Classic location: In the depression three cùn either side of the spine, below the fourteenth vertebra. The point is found in straight sitting posture. (Zhēn Jiǔ Dà Chéng)

Local anatomy: The lateral branch of the posterior ramus of the 12th thoracic nerve and the lateral branch of the 1st lumbar nerve.

Action: Supplements the kidney and boosts essence; disinhibits urine and abducts dampness.

Modern indications: Seminal emission; impotence; inhibited urination; water swelling; painful stiffness of the back.

Classic indications: Abdominal distension; rib-side fullness; pain and swelling of the genitals; dribbling urination; vomiting counterflow; nontransformation of grain and water (undigested food in the stool); sudden turmoil (cholera).

Needle stimulus: Needling: 0.7‒1.0 cùn perpendicular insertion. Moxa: 7‒15 cones; pole 10‒30 min.

Needle sensation: Distension and numbness, spreading either downward or downward and outward.

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