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BL40 · Bladder Meridian of Foot-Taiyang

Weizhong 委中 (BL40)

Wěizhōng

LOCATION At the midpoint of the popliteal crease, between the tendons of biceps femoris and semitendinosus.
INDICATIONS Lumbago, disorders of the knee, contracture of the leg, hemiplegia, vomiting and diarrhoea, skin diseases.
ACTIONS Clears summer heat, cools the blood, frees the channel, benefits the lower back and knee.
NEEDLING Perpendicular insertion 1 to 1.5 cun, or prick the superficial vein to let blood. Avoid the popliteal artery.
MOXIBUSTION No moxa cone at this point.
CAUTION The <em>Lingshu</em> calls it “the blood cleft”; strict asepsis is required when bleeding it.

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