Acu-moxa point chart, showing the weizhong (Middle of the Crook) point, from Chuanwu lingji lu (Record of Sovereign Teachings), by Zhang Youheng, a treatise on acu-moxa in two volumes. This work survives only in a manuscript draft, completed in 1869 (8th year of the Tongzhi reign period of the Qing dynasty). The weizhong point is located at the back of the knee joint, in the middle of the popliteal crease. It can be needled to a depth of 5 fen (1 fen [ cun/Chinese proportional inch] = c. 0.

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Chinese Acu-moxa Point Chart, 1869

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