《黄帝内经·素问·金匮真言论》
从脏腑的阴阳划分来说，则脏属阴，腑属阳，肝、心、脾、肺、肾五脏都属阴。
言人身之脏腑中阴阳，则脏者为阴，腑者为阳。
In terms of the yin-yang of the internal organs, the internal organs belong to yin, while the six fu organs belong to yang. The five internal organs of liver, heart, spleen, lung, and kidney all belong to yin.