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Alternate names: BL-49

Channel: BL, foot greater yáng (tài yáng) bladder channel

Modern location: An acupoint located on the buttocks, level with the sacrococcygeal joint, 3 cùn lateral to the midline.

Classical location: In the depression three cùn either side of the spine, below the twentieth vertebra. The point is found in prostrate posture. From The Great Compendium of Acupuncture and Moxibustion (针灸大成 zhēn jiǔ dà chéng)

Local anatomy: The inferior gluteal artery and vein. The inferior gluteal nerve, the posterior femoral cutaneous nerve and sciatic nerve.

Action: Courses the channels and network vessels; strengthens the knee and lumbus.

Modern indications: Inhibited urination; constipation; hemorrhoids; lumbosacral pain; wilting-impediment (wěi bì) of the lower limbs.

Classical indications: Inhibited urination; genital pain.

Needle stimulus: Needling: 1.0‒1.5 cùn perpendicular insertion. Moxa: 3‒7 cones; pole 20‒50 min.

Needle sensation: Distension and numbness, spreading down the legs.

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