\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
宗气积聚在胸中，从喉咙发出，贯通心脉并推动呼吸。《灵枢·决气篇》说：上焦开发宣散，布散五谷的精微气味，熏蒸肌肤，充盈身体，润泽毫毛，就像雾露滋润万物一样，这就叫做宗气。“宗”的意思是宏大。
营气属于阴气，是水谷精微中的精气部分。其中运行于经脉之中的精气，称为营气。营气产生于中焦，在胃中消化后，出于上焦之后，向上注入肺脏，接受清气并提取汁液转化为血液，以供养生命躯体，没有比这更珍贵的了。营气的运行始于手太阴肺经，逐渐向下运行，最终止于足厥阴肝经，随着宗气在十二经脉的通道中运行，所以说“清轻的部分成为营气，营气行走在脉管之中”。
卫气属于阳气，是水谷精微中剽悍滑利的部分。其中浮越、疾速、滑利且不循行于经脉之中的气，称为卫气。卫气产生于下焦，逐渐上升，每天清晨阴气尽时，阳气出于眼部的睛明穴，向上运行至头部，白天从足太阳膀胱经开始，行走在六条阳经然后进入阴分；夜晚从足少阴肾经开始，行走在六条阴经再注入肾脏，昼夜各循环二十五周，不跟随宗气而自行在各经的皮肤和肌肉间隙之间运行，所以说“重浊的部分成为卫气，卫气行走在脉管之外”。
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.