难经正义 · 叶霖 · Chapter 63 of 82

卷五 六十二难

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卷五 六十二难

六十二难曰:脏井荥有五,腑独有六者,何谓也?

然:腑者阳也。三焦行于诸阳,故置一输,名曰原。腑有六者,亦与三焦共一气也。

脏有五者,谓井、荥、输、经、合也。腑有六者,谓井、荥、输、原、经、合也。夫五脏之脉,皆以所出为井,所流为荥,所注为输,所行为经,所入为合,是谓五俞,以应五行木、火、土、金、水也。六腑亦有俞,以应五行金、水、木、火、土也,惟过之穴为原,故有六也。原者,元也。元气者,三焦之气也。盖三焦包络主相火,故列五行之外,而三焦所行者远,其气所流聚之处,五穴不足以尽之,故别置一穴,名曰原也。三焦为阳气之根,六腑属阳,其气皆三焦所出,故曰共一气也。

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