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

Modern location: An acupoint located on the sacrum, in the first sacral foramen.

Classic location: In the first opening one cùn below the lumbar bone, in the depression either side of the spine. (Zhēn Jiǔ Jiǎ Yǐ Jīng)

Local anatomy: Posterior branches of the lateral sacral artery and vein. The site where the posterior ramus of the 1st sacral nerve passes.

Action: Frees the channels and quickens the network vessels; supplements the lower burner; strengthens the lumbus.

Modern indications: Inhibited defecation and urination; menstrual irregularities; vaginal discharge; yīn protrusion (prolapse of the uterus); seminal emission; impotence; lumbar pain.

Classic indications: Genital itch; red and white vaginal discharge; strangury-turbidity (lìn zhuó); retching counterflow; nosebleed; infertility; malarial disease heat effusion with aversion to cold.

Needle stimulus: Needling: 0.7‒1.0 cùn perpendicular insertion. Moxa: 3‒7 cones; pole 20‒30 min.

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

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