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Alternate names: BL-42

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

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

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

Local anatomy: Posterior branches of the intercostal artery and vein. Lateral branches of the posterior rami of the 7th and 8th thoracic nerves.

Action: Courses the liver and rectifies qì; fortifies the spleen and harmonizes the stomach; frees and regulates bowel qì.

Modern indications: Chest and rib-side pain; retching and vomiting; diarrhea; back pain.

Classic indications: Inability to get food and drink down; rumbling intestines and diarrhea; reddish urine; irregular defecation; hypertonicity of the sinews and bone pain.

Needle stimulus: Needling: 0.5 cùn downward oblique insertion. Moxa: 3‒7 cones; pole 5‒20 min.

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