Illustration of 'Problem 67' in Huang Di ba shi yi nan jing (Canon of Eighty-One [Medical] Problems [in the Inner Canon] of the Yellow Lord), preserved in Zhengtong daozang (Daoist Canon compiled during the Zhengtong reign period [1436-1449] of the Ming Dynasty).
'Problem 67' is explained thus:
Heart Evelope (pericardium, xinbao) channel of hand jueyin: Zhongchong (Middle Rushing), where it exits, is a ying (spring) point (error for jing [well]) point with the attribute of wood; laogong (Palace of Toil), where it flows, is a jing (well) point (error for ying [spring]) with the attribute of fire; daling (Great Mound), where it gushes, is a shu (stream) point with the attribute of earth; jianshi (Intermediate Messenger), where it travels, is a jing (river) point with the attribute of metal; qufeng, where it enters, is a he (sea) point with the attribute of water.
Lung channel of hand taiyin: Shaoshang (Lesser Shang), where it exits, is a jing (well) point with the attribute of wood; yuji Fish Border), where it flows, is a ying (spring) point with the attribute of fire; taiyuan (Great Abyss), where it gushes, is a shu (stream) point with the attribute of earth; jingqu (Channel Ditch), where it travels, is a jing (river) point with the attribute of metal; chize (Foot Marsh), where it enters, is a he (sea) point with the attribute of water.
