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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 fourth lumbar vertebra, 1.5 cùn lateral to the midline.

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

Local anatomy: The posterior rami of the 4th lumbar artery and vein. The posterior ramus of the 3rd lumbar nerve.

Action: Courses and regulates the large and small intestine; rectifies qì and transforms stagnation.

Modern indications: Abdominal distension; diarrhea; constipation; lumbar pain.

Classic indications: Rumbling intestines and abdominal distension; intestinal afflux (cháng pì) diarrhea; inability to get food and drink down; stabbing pain in the umbilical region; emaciation despite large food intake; inhibited urination and defecation; gripping pain in the smaller abdomen.

Needle stimulus: Needling: 0.5‒1.0 cùn perpendicular insertion. Moxa: 5‒10 cones; pole 20‒30 min.

Needle sensation: twinge and distension, often spreading downward.

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

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