\r宗营卫三气图\pt13a94.bmp\r
宗气积于胸中，出于喉咙，以贯心脉而行呼吸。决气篇曰∶上焦开发，宣五谷味，熏肤
充身泽毛，若雾露之溉者，是谓宗气。宗之为言大也。
营气者，阴气也，水谷之精气也。其精气之行于经者，为营气。营气出于中焦，并胃中
出上焦之后，上注于肺，受气取汁化而为血，以奉生身，莫贵于此。其行始于太阴肺经，渐
降而下，而终于厥阴肝经，随宗气而行于十二经隧之中，故曰清者为营，营行脉中。
卫气者，阳气也，水谷之悍气也。其浮气之 疾滑利而不循于经者，为卫气。卫气出
于下焦，渐升而上，每日平旦阴尽，阳气出于目之睛明穴，上行于头，昼自足太阳始，行于六
阳经以下阴分，夜自足少阴始，行于六阴经复注于肾，昼夜各二十五周，不随宗气而自行于
各经皮肤分肉之间，故曰浊者为卫，卫行脉外。
\r脏腑井原不同图\pt13a95.bmp\r
\r十二经井荥 原经合总图\pt13a96.bmp\r
\r太阳少阳井合图一\pt13a97.bmp\r
\r太阳少阳井合图二\pt13a97-1.bmp\r
\r阳明太阴井合图一\pt13a98.bmp\r
\r阳明太阴井合图二\pt13a98-1.bmp\r
\r少阴厥阴井合图一\pt13a99.bmp\r
\r少阴厥阴井合图二\pt13a99-1.bmp\r
Zong Qi (Pectoral Qi) accumulates in the chest, emerges from the throat, penetrates the heart vessels, and governs respiration. The *Jueqi* Chapter states: "The Upper Jiao opens and develops, disseminating the flavors of the five grains; it steams the skin, fills the body, and moistens the hair, like mist and dew irrigating [all things]. This is called Zong Qi." The term "Zong" implies greatness or magnitude.
Ying Qi (Nutritive Qi) is Yin Qi, specifically the essence extracted from food and drink. That portion of this essence which circulates within the meridians is termed Ying Qi. Ying Qi originates in the Middle Jiao; after emerging from the stomach, it proceeds to the Upper Jiao, ascends to the lungs, receives Qi, extracts fluids, and transforms into blood to nourish the living body. Nothing is more precious than this. Its circulation begins at the Lung Meridian of Hand-Taiyin, gradually descends, and terminates at the Liver Meridian of Foot-Jueyin. It travels through the twelve vessel pathways along with Zong Qi. Thus, it is said that the clear and pure part becomes Ying Qi, and Ying Qi circulates within the vessels.
Wei Qi (Defensive Qi) is Yang Qi, specifically the fierce and rapid Qi derived from food and drink. That portion of floating Qi which is swift, slippery, and does not follow the course of the meridians is termed Wei Qi. Wei Qi originates in the Lower Jiao and gradually ascends. Each day at dawn, when Yin is exhausted, Yang Qi emerges from the Jingming acupoint (BL1) of the eyes, ascends to the head, and during the day begins with the Bladder Meridian of Foot-Taiyang, circulating through the six Yang meridians before entering the Yin aspects. At night, it begins with the Kidney Meridian of Foot-Shaoyin, circulating through the six Yin meridians before returning to the Kidneys. It completes twenty-five circuits during the day and twenty-five during the night. It does not follow Zong Qi but circulates independently among the skin and muscle layers of each meridian. Thus, it is said that the turbid and heavy part becomes Wei Qi, and Wei Qi circulates outside the vessels.