六十六难曰∶经言肺之原出于太渊，心之原出于大陵，肝之原出于太冲，脾之原出于太白，肾
之原出于太溪，少阴之原出于兑骨，（神门穴也。）胆之原出于丘墟，胃之原出于冲阳，三焦之原出于
阳池，膀胱之原出于京骨，大肠之原出于合谷，小肠之原出于腕骨。
考《甲乙经》，肺之原太渊，在手掌后陷者中央，心之原大陵，在掌后骨下横纹中两筋间，此
手厥阴心包络之穴也，心与包络相通，故取此穴，亦可谓之心也。肝之原太冲，在足大指本节后二
寸陷者中。脾之原太白，在足大指后内侧白肉际陷者中。肾之原太溪，在足内踝后跟骨上动脉陷者
中。手少阴之原兑骨，即神门穴，在手掌后锐骨端陷者中。胆之原丘墟，在足外踝如前陷者中。胃
之原冲阳，在足趺上，去内庭五寸，高骨间动脉。三焦之原阳池，在手表腕上陷者中。膀胱之原京
骨，在足小指外侧，本节后大骨下白肉际陷者中。大肠之原合谷，在手大指次指歧骨间陷者中。小
肠之原腕骨，在手外侧腕前起骨下陷者中。
按∶《灵枢·九针十二原篇》曰∶阳中之少阴肺也，其原出于太渊，太渊二。阳中之太阳心也，
其原出于大陵，大陵二。阴中之少阳肝也，其原出于太冲，太冲二。阴中之至阴脾也，其原出于太
白，太白二。阴中之太阴肾也，其原出于太溪，太溪二。膏之原出于鸠尾，鸠尾一。
肓之原出于脖 ，脖 一。凡此十二原者，主治五脏六腑之有疾者也。胀取三阳，飧泄取三阴。
是《灵枢》以五脏之十二穴为原，此则以六脏六腑十二经各有原。言心之原出于大陵者，即候包
络之病，盖君相之血脉通贯也。言少阴之原出于兑骨者，少阴心也，兑骨即神门。邪客篇曰∶
少阴独无输者，不病乎？曰，其外经病而脏不病，故独取经于掌后锐骨之端，即此义也。越人
之意，非谓心有两原，乃指君相气合厥阴少阴，可同治也。
十二经皆以输为原者，何也？然五脏输者，三焦之所行，气之所留止也。三焦所行之输为原
者，何也？
然∶齐下肾间动气者，人之生命也，十二经之根本也，故名曰原。三焦者，原气之别
使也，主通行三气，经历于五脏六腑。原者，三焦之尊号也，故所止辄为原。五脏六腑之有病者，
皆取其原也。
十二经皆以输为原者，言九针十二原中。皆以五脏之输穴为原，非谓六腑也。然五脏六腑之
输，皆系三焦之所行，其气所留止之处也，故称曰原。三焦之根，起于肾间命门，人之生命之
原，十二经之根本，皆系乎此。由鼻吸入之天阳，过肺历心，引心火循膂筋，入肾系，至命门，
蒸膀胱之水，化气上腾。三焦主持相火，为肾中原气之别使，是十二经之营卫流行，皆三焦之
所使也。通行生气于五脏六腑之输穴，其所留止，辄谓之原。以其原于命门动气间而得名，亦
以见三焦乃腹包膜，其连网脂膜，皆三焦之物，为统摄脏腑之郛郭也。
第六十六难说：医经中说，肺的原穴出于太渊，心的原穴出于大陵，肝的原穴出于太冲，脾的原穴出于太白，肾的原穴出于太溪，手少阴心经的原穴出于兑骨（即神门穴），胆的原穴出于丘墟，胃的原穴出于冲阳，三焦的原穴出于阳池，膀胱的原穴出于京骨，大肠的原穴出于合谷，小肠的原穴出于腕骨。
考证《针灸甲乙经》，肺的原穴太渊，位于手掌后方凹陷处的中央；心的原穴大陵，位于手腕后横纹中两筋之间，这是手厥阴心包经的穴位，因为心与心包络相通，所以取这个穴位，也可以称之为心的原穴。肝的原穴太冲，位于足大趾本节后方二寸的凹陷处。脾的原穴太白，位于足大趾后方内侧白肉边缘的凹陷处。肾的原穴太溪，位于足内踝后方跟骨上方的动脉凹陷处。手少阴心经的原穴兑骨，就是神门穴，位于手掌后方锐骨端的凹陷处。胆的原穴丘墟，位于足外踝前方如前的凹陷处。胃的原穴冲阳，位于足背上，距离内庭穴五寸，高骨之间的动脉处。三焦的原穴阳池，位于手腕背侧上方的凹陷处。膀胱的原穴京骨，位于足小趾外侧，本节后方大骨下白肉边缘的凹陷处。大肠的原穴合谷，位于手大指与次指分叉骨间的凹陷处。小肠的原穴腕骨，位于手外侧腕前起始骨骼下的凹陷处。
按语：《灵枢·九针十二原篇》说：属阳中的少阴是肺，其原穴出于太渊，有两个太渊穴。属阳中的太阳是心，其原穴出于大陵，有两个大陵穴。属阴中的少阳是肝，其原穴出于太冲，有两个太冲穴。属阴中的至阴是脾，其原穴出于太白，有两个太白穴。属阴中的太阴是肾，其原穴出于太溪，有两个太溪穴。膏的原穴出于鸠尾，有一个鸠尾穴。肓的原穴出于脖胦，有一个脖胦穴。这十二个原穴，主治五脏六腑的疾病。胀病取三阳经的原穴，完谷不化的泄泻取三阴经的原穴。《灵枢》以五脏的十二个穴位作为原穴，而本难经则认为六脏六腑十二条经脉各有原穴。说心的原穴出于大陵，即是诊察心包络的疾病，这是因为君火与相火的血脉贯通的缘故。说手少阴心经的原穴出于兑骨，少阴指的是心，兑骨就是神门穴。《灵枢·邪客篇》说：为什么唯独手少阴没有输穴呢？回答说，它的外经有病而内脏无病，所以单独从手掌后方锐骨端取经，就是这个道理。越人（秦越人，即扁鹊）的本意，并不是说心有两个原穴，而是指出君火与相火的气机结合于厥阴和少阴，可以共同治疗。
为什么十二经脉都以输穴作为原穴呢？回答说：五脏的输穴，是三焦之气所运行的部位，也是真气停留止聚的地方。为什么三焦所运行的输穴被称为原穴呢？
回答说：脐下肾间动气，是人的生命之本，也是十二经脉的根本，所以称为原穴。三焦，是原气的别使，主要通行上、中、下三焦之气，经历并灌注于五脏六腑。原穴，是三焦的尊称，所以真气停留之处就称为原穴。五脏六腑有疾病的，都要选取其原穴进行治疗。
十二经脉都以输穴作为原穴，是指在《九针十二原》篇中，都是以五脏的输穴为原穴，并非指六腑。然而五脏六腑的输穴，都隶属于三焦之气所运行的路径，是其气停留止聚之处，所以称为原穴。三焦的根源，起于肾间的命门，这是人的生命之源，十二经脉的根本，都系于此。由鼻吸入的天阳之气，经过肺，传至心，引导心火沿着脊背的筋脉，进入肾系，到达命门，蒸腾膀胱的水液，化为气化而上腾。三焦主持相火，作为肾中原气的别使，使得十二经脉的营卫之气流行，都由三焦所驱使。在三焦的作用下，生气通行于五脏六腑的输穴，真气停留之处，就称之为原穴。因为它源于命门的动气，所以得名，这也显示出三焦乃是腹部的包膜，其连接的网膜脂膜，都是三焦所属之物，是统摄脏腑的外廓。
Chapter 66 states: The classic texts say that the Yuan-Source point of the Lung is Taiyuan (LU-9), the Yuan-Source point of the Heart is Daling (PC-7), the Yuan-Source point of the Liver is Taichong (LR-3), the Yuan-Source point of the Spleen is Taibai (SP-3), the Yuan-Source point of the Kidney is Taixi (KI-3), the Yuan-Source point of the Hand-Shaoyin Heart meridian is Duigu (i.e., Shenmen, HT-7), the Yuan-Source point of the Gallbladder is Qiuxu (GB-40), the Yuan-Source point of the Stomach is Chongyang (ST-42), the Yuan-Source point of the Sanjiao (Triple Burner) is Yangchi (TE-4), the Yuan-Source point of the Bladder is Jinggu (BL-64), the Yuan-Source point of the Large Intestine is Hegu (LI-4), and the Yuan-Source point of the Small Intestine is Wangu (SI-4).
Examining the *Jia Yi Jing* (Systematic Classic of Acupuncture and Moxibustion), the Yuan-Source point of the Lung, Taiyuan, is located in the center of the depression behind the palm. The Yuan-Source point of the Heart, Daling, is located in the transverse crease at the back of the palm, between the two tendons; this is an acupoint of the Hand-Jueyin Pericardium meridian. Since the Heart and the Pericardium are interconnected, selecting this point can also be regarded as treating the Heart. The Yuan-Source point of the Liver, Taichong, is located in the depression two cun posterior to the metatarsophalangeal joint of the great toe. The Yuan-Source point of the Spleen, Taibai, is located in the depression at the medial border of the white skin on the foot, posterior to the great toe. The Yuan-Source point of the Kidney, Taixi, is located in the depression above the calcaneus, posterior to the medial malleolus, where the artery beats. The Yuan-Source point of the Hand-Shaoyin Heart meridian, Duigu, is Shenmen (HT-7), located in the depression at the end of the sharp bone at the back of the palm. The Yuan-Source point of the Gallbladder, Qiuxu, is located in the depression anterior to the lateral malleolus. The Yuan-Source point of the Stomach, Chongyang, is located on the dorsum of the foot, five cun from Neiting (ST-44), in the depression between the high bones where the artery beats. The Yuan-Source point of the Sanjiao (Triple Burner), Yangchi, is located in the depression on the dorsal aspect of the wrist. The Yuan-Source point of the Bladder, Jinggu, is located in the depression below the large bone posterior to the metatarsophalangeal joint of the little toe, at the medial border of the white skin. The Yuan-Source point of the Large Intestine, Hegu, is located in the depression between the divergent bones of the thumb and index finger. The Yuan-Source point of the Small Intestine, Wangu, is located in the depression below the starting bone anteriorly on the lateral side of the hand.
Commentary: The *Ling Shu · Chapter on Nine Needles and Twelve Original Points* states: "The Shaoyin within Yang is the Lung, its Yuan-Source point is Taiyuan, two points. The Taiyang within Yang is the Heart, its Yuan-Source point is Daling, two points. The Shaoyang within Yin is the Liver, its Yuan-Source point is Taichong, two points. the Zhiyin within Yin is the Spleen, its Yuan-Source point is Taibai, two points. The Taiyin within Yin is the Kidney, its Yuan-Source point is Taixi, two points. The Yuan-Source point of the Gao (fat surrounding the viscera) is Jiutui (CV-15), one point. The Yuan-Source point of the Huang (membrane below the diaphragm) is Boyang (CV-12), one point. These twelve Yuan-Source points govern diseases of the five Zang organs and six Fu organs. For distension, select the Yuan-Source points of the Three Yang meridians; for undigested food diarrhea, select the Yuan-Source points of the Three Yin meridians." The *Ling Shu* regards the twelve points of the five Zang organs as the Yuan-Source points, whereas this chapter posits that each of the six Zang and six Fu organs, comprising twelve meridians, has its own Yuan-Source point. To say that the Yuan-Source point of the Heart is Daling refers to diagnosing/treating diseases of the Pericardium, because the vessels of the Ministerial Fire and the Sovereign Fire are interconnected. To say that the Yuan-Source point of the Shaoyin is Duigu refers to the Heart (Shaoyin); Duigu is Shenmen. The *Xie Ke Pian* (Chapter on Evil Invasion) asks: "Why does the Shaoyin have no Shu points?" The answer is: "Its exterior meridian may be diseased while the interior organ remains healthy, so one exclusively selects the point at the end of the sharp bone at the back of the palm," which illustrates this principle. Yueren's (Bian Que's) intent was not to claim that the Heart has two Yuan-Source points, but rather to indicate that the Qi of the Sovereign Fire and Ministerial Fire combines with Jueyin and Shaoyin, allowing for combined treatment.
Why do all twelve meridians use the Shu points as Yuan-Source points? The response is: The Shu points of the five Zang organs are where the Qi of the Sanjiao (Triple Burner) travels and where the vital Qi stays and stops. Why are the Shu points traveled by the Sanjiao called Yuan-Source points?
The response is: The moving Qi between the kidneys below the umbilicus is the root of human life and the foundation of the twelve meridians, hence it is named Yuan-Source. The Sanjiao (Triple Burner) is the special envoy of the Yuan-Source Qi, primarily responsible for circulating the Qi of the Upper, Middle, and Lower Burners, passing through the five Zang organs and six Fu organs. Yuan-Source is a honorific title for the Sanjiao; therefore, wherever the Qi stops, it is called the Yuan-Source. When the five Zang organs and six Fu organs suffer from disease, their Yuan-Source points should be selected.
When it says all twelve meridians use the Shu points as Yuan-Source points, it refers to the *Nine Needles and Twelve Original Points* chapter, stating that the Shu points of the five Zang organs are used as Yuan-Source points, not those of the Fu organs. However, the Shu points of both the five Zang and six Fu organs are all pathways of the Sanjiao Qi, places where its energy stays and stops, thus they are called Yuan-Source. The root of the Sanjiao originates from the Mingmen (Gate of Life) between the kidneys. This is the original source of human life and the foundation of the twelve meridians. The Heavenly Yang Qi inhaled through the nose passes through the Lungs, reaches the Heart, guides the Heart Fire along the spinal muscles into the Kidney system, arrives at the Mingmen, steams the water of the Bladder, transforms it into Qi, and ascends. The Sanjiao controls the Ministerial Fire and acts as the special envoy of the original Qi in the Kidneys, causing the Ying (Nutritive) and Wei (Defensive) Qi of the twelve meridians to circulate, all driven by the Sanjiao. It circulates Sheng (Vital) Qi to the Shu points of the five Zang and six Fu organs; where this Qi stays and stops, it is termed Yuan-Source. It derives its name from the moving Qi between the Mingmen, also revealing that the Sanjiao is the abdominal membrane, and its connected omental fatty tissues belong to the Sanjiao, serving as the outer casing that encompasses and regulates the Zang and Fu organs.