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Alternate names: 大阴 dà yīn, Great Yin; 太阴 tài yīn, Supreme Yin; 中髎 zhōng xī, Central Cleft

Channel: LR, Foot Reverting Yīn (jué yīn) Liver Channel

Modern location: An acupoint located on the medial aspect of the lower leg, 7 cùn superior to the tip of the medial malleolus, in a small groove or dishlike depression on the tibia.

Classic location: Seven cùn above the inner anklebone, at the midpoint of the shinbone, parallel to the lesser yīn (shào yīn). (Zhēn Jiǔ Dà Chéng)

Local anatomy: The great saphenous vein. The branch of the saphenous nerve.

Action: Frees the channels and network vessels; regulates qì and blood; relieves pain.

Modern indications: Mounting qì (shàn qì, inguinal hernia); flooding and spotting; abdominal pain; diarrhea; incessant flow of the lochia.

Classic indications: Profuse flooding and spotting; abdominal pain; persistent flow of lochia; cold in the lower leg; damp impediment (shī bì) with an inability to walk; fulminant pain of the genitalia.

Needle stimulus: Needling: 0.2‒0.5 cùn backward oblique insertion. Moxa: 5 cones; pole 5‒10 min.

Point groups: Cleft point (xī xué) of the liver channel.

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