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Alternate names: 百虫窠 bǎi chóng kē, Hundred Worm Burrow; 血郄 xuè xī, Blood Cleft

Channel: SP, Foot Greater Yīn (tài yīn) Spleen Channel

Modern location: An acupoint located on the anteromedial aspect of the thigh, in the prominence of the vastus medialis muscle 2 cùn superior and slightly medial to the superior medial corner of the patella.

Classic location: Two and a half cùn above the kneecap, on the border of the white flesh on the inner side. (Zhēn Jiǔ Dà Chéng)

Local anatomy: Muscular branches of the femoral artery and vein. The anterior femoral cutaneous nerve and the muscular branch of the femoral nerve.

Action: Regulates and clears the blood; perfuses the lower burner.

Modern indications: Menstrual irregularities; amenorrhea; flooding and spotting; dormant papules: eczema; cinnabar toxin (dān dú).

Classic indications: Malign blood discharge from the uterus; painful, itching sores or red, swollen purulent sores on the inner side of the thigh; genital sores; the five stranguries.

Needle stimulus: Needling: 0.5‒1.2 cùn perpendicular insertion. Moxa: 3‒5 cones; pole 5‒10 min.

Needle sensation: Localized twinge and distension, sometimes spreading into the knee joint, or to the hip.

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