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Alternate names: 腨肠 chuǎi cháng, Calf Intestine; 直肠 zhí cháng, Rectum

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

Modern location: An acupoint located on the posterior aspect of the lower leg, midway between BL-55 and BL-57, between the two heads of the gastrocnemius muscle.

Classical location: Below Yáng Union (BL-55), in the depression at the center of the calf, seven cùn above the heel. From The Golden Mirror of Medicine (医宗金鑑 yī zōng jīn jiàn)

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

Action: Soothes the sinews and quickens the network vessels.

Modern indications: Hemorrhoids; pain and hypertonicity of the lumbus and leg.

Classical indications: Cholera cramps; axillary swelling; impediment (bì) of the lower leg; dizziness and headache.

Needle stimulus: Needling: 0.5 cùn perpendicular insertion (see Warnings). Moxa: 3 cones; pole 5‒20 min.

Warning: Needling of this point is contraindicated in some texts.

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