《太阴阳明论》曰∶太阴阳明为表里，脾胃脉也。生病而异者，何也？岐伯曰∶阴阳异位，
更虚更实，更逆更从，或从内，或从外，所从不同，故病异名也。（脾脏为阴，胃府为阳，阳脉下行，
阴脉上行，阳脉从外，阴脉从内，故言所从不同、病异名也。春夏阳明为实，太阴为虚，秋冬
阳明为虚，太阴为实，即更实更虚也。春夏太阴为逆，阳明为从，秋冬阳明为逆，太阴为从，即
更逆更从也。）阳者，天气也，主外；阴者，地气也，主内。（是所谓阴阳异位也。）故阳道实，
阴道虚。（是所谓更实更虚也。）犯贼风虚邪者，阳受之∶食饮不节，起居不时者，阴受之。
（是所谓或从内或从外也。阳受之则入六腑，阴受之则入五脏。入六腑则身热不时卧，上为喘呼；
入五脏则 满闭塞，下为飧泄，久为肠 。（是所谓所从不同病异名也。）故喉主天气，咽主地
气，故阳受风气，阴受湿气。（同气相求耳。）故阴气从手行至头，而下行循臂至指端；阳气从手上
行至头，而下行至足。（是所谓更逆更从也。《灵枢》曰∶手之三阴，从脏走手；手之三阳，从
手走头；足之三阳，从头走足；足之三阴，从足走腹。所行而异，故更逆更从也。）故曰阳病者，
上行而极下，阴病者，下行而极上。故伤于风者，上先受之；伤于湿者，下先受之。
脾不主时何也？（肝主春，心主夏，肺主秋，肾主冬，四脏皆有正应，而脾无正主也。）
脾者，土也，治中央，常以四时长四脏，各十八日寄治，不得独主于时也。脾脏者，常着胃土之精
也。土者，生万物，而法天地，故上下至头足。足太阴者，三阴也，故太阴为之行气于三阴。阳明
者，表也，五脏六腑之海也，亦为之行气于三阳。脏腑各因其经，而受气于阳明。
The *Taiyin Yangming Lun* (Treatise on Taiyin and Yangming) states: Taiyin and Yangming are exterior-interior counterparts, belonging to the Spleen and Stomach meridians. Why do they manifest different diseases? Qibo replied: The locations of Yin and Yang differ; they alternate between deficiency and excess, and between reversal and compliance. Some pathogens originate from within, others from without. Since their origins differ, the disease names vary accordingly. (The Spleen Zang is Yin, the Stomach Fu is Yang. Yang meridians descend, Yin meridians ascend. Yang meridians govern the exterior, Yin meridians govern the interior. Hence, it is said that origins differ and disease names vary. In spring and summer, Yangming is in a state of excess while Taiyin is in deficiency; in autumn and winter, Yangming is in deficiency while Taiyin is in excess. This is the alternation of excess and deficiency. In spring and summer, Taiyin is considered "reversal" (ni) and Yangming "compliance" (cong); in autumn and winter, Yangming is "reversal" and Taiyin "compliance". This is the alternation of reversal and compliance.) Yang represents Heaven Qi, governing the exterior; Yin represents Earth Qi, governing the interior. (This is what is meant by differing locations of Yin and Yang.) Therefore, the Path of Yang tends toward excess, and the Path of Yin tends toward deficiency. (This is the alternation of excess and deficiency.) Those who contract thieving winds and empty pathogens are affected by Yang; those whose diet is irregular and daily routine untimely are affected by Yin. (This is what is meant by some originating from within and others from without. When Yang is affected, the pathogen enters the Six Fu Organs; when Yin is affected, it enters the Five Zang Organs. Entering the Six Fu Organs leads to fever and inability to lie down at proper times, with upward manifestations such as panting and calling out; entering the Five Zang Organs leads to fullness and obstruction, with downward manifestations such as undigested stool diarrhea (Sun Xie), which over time develops into Chang Pi (dysentery/intestinal inflammation). This is what is meant by different origins leading to different disease names.) Thus, the throat governs Heaven Qi, and the pharynx governs Earth Qi. Therefore, Yang meridians receive Wind pathogens, and Yin meridians receive Dampness pathogens. (This is due to the attraction of similar energies.) Thus, Yin Qi flows from the hands to the head, then descends along the arms to the fingertips; Yang Qi flows from the hands to the head, then descends to the feet. (This is the alternation of reversal and compliance. The *Ling Shu* states: The Three Yin Meridians of the Hand travel from the Zang organs to the hands; the Three Yang Meridians of the Hand travel from the hands to the head; the Three Yang Meridians of the Foot travel from the head to the feet; the Three Yin Meridians of the Foot travel from the feet to the abdomen. Their paths differ, hence there is alternation of reversal and compliance.) Therefore, it is said that Yang diseases, after reaching their peak upward, tend to descend; Yin diseases, after reaching their peak downward, tend to ascend. Thus, those injured by Wind are first affected in the upper parts; those injured by Dampness are first affected in the lower parts.
Why does the Spleen not govern a specific season? (The Liver governs Spring, the Heart Summer, the Lung Autumn, and the Kidney Winter. The Four Zang organs each have a corresponding primary season, but the Spleen does not have one.) The Spleen belongs to Earth, manages the Center, and nourishes the Four Zang organs throughout the four seasons. It presides for eighteen days during the last period of each season, and thus cannot exclusively govern a single season. The Spleen Zang constantly manifests the essence of the Stomach Earth. Earth generates all things and models Heaven and Earth, so its qi extends from the top to the bottom, reaching the head and feet. The Foot-Taiyin [Spleen] meridian is among the Three Yin meridians; therefore, Taiyin circulates Qi through the Three Yin meridians. Yangming [Stomach] is the exterior and the Sea of the Five Zang and Six Fu organs; it also circulates Qi through the Three Yang meridians. The Zang and Fu organs each receive Qi from Yangming via their respective meridians.