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BL-55 Yáng Union

合阳 〔合陽〕 hé yáng

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

Modern location: An acupoint located on the posterior aspect of the lower leg, 2 cùn inferior to the center of the popliteal crease, between the two heads of the gastrocnemius muscle.

Classical location: Three cùn below the crease of the knee. From The Great Compendium of Acupuncture and Moxibustion (针灸大成 zhēn jiǔ dà chéng)

Local anatomy: The small saphenous vein; deeper, the popliteal artery and vein. The medial sural cutaneous nerve; deeper, the tibial nerve.

Action: Strengthens the lumbus and boosts the kidney; soothes the sinews and quickens the network vessels; regulates the penetrating and controlling vessels.

Modern indications: Back pain; wilting-impediment (wěi bì) of the lower limbs; mounting qì (shàn qì, inguinal hernia) of the lower limbs; flooding and spotting.

Classical indications: Heat in the inner thigh; flooding and spotting and vaginal discharge; mounting (shàn) pain; fulminant genital pain; abdominal pain.

Needle stimulus: Needling: 0.7‒1.0 cùn perpendicular insertion. Moxa: 3‒5 cones; pole 5‒10 min.

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