《黄帝内经·素问·阴阳离合论》
因此，三阳经的离合，分开来说，太阳主表为开，阳明主里为阖，少阳介于表里之间为枢。
是故三阳之离合也：太阳为开，阳明为阖，少阳为枢。
Therefore, the separation and combination of the three yang meridians are, speaking separately, Taiyang mainly externals as opening, Yangming mainly internals as closing, and Shaoyang is in between the externals and internals as a pivot.