经云∶肺者，相傅之官，治节出焉。其形四垂，附着于脊之第三椎中。有二十四空，
行列分布，以行诸脏之气，为脏之长，为心之盖。又云∶是经常多气少血。
《难经》曰∶肺重三斤三两，六叶两耳，凡八叶，主藏魄。
《中藏经》曰∶肺者生气之原，乃五脏之华盖。
张介宾曰∶肺叶白莹，谓为华盖，以覆诸脏。虚如蜂窠，下无透窍，吸之则满，呼
之则虚，一呼一吸，消息自然，司清浊之运化，为人身之橐 。
\r手太阴肺脏图\p06-d43a47.bmp\r
肺手太阴之脉，起于中焦，下络大肠，还循胃口，上膈属肺，从肺系横出腋下，下循
内，行少阴心主之前，下肘中循臂内上骨下廉，入寸口上鱼，循鱼际出大指之端；其
支者，从腕后直出次指内廉，出其端。
\r肺经循行图\p06-d43a48.bmp\r
手太阴肺中焦生，络肠循胃散流行，上膈属肺从肺系，横出腋下 肘中，循臂寸口
上鱼际，大指内侧爪端通，支络还从腕后出，接次指属阳明经。
【注】手太阴肺经之脉，起于中焦者，言起于任脉中脘穴也。下络大肠，还循胃口者，
谓本经之络，散布流行，下则络于大肠，还上而循胃口，非上膈属肺直行之经也。夫经
络流行，循还无端。故手太阴之脉，必自足厥阴经之支者期门穴，循行中脘穴，上膈属
肺，以交于手太阴肺经也。从肺系横出腋下，至于中府、云门穴，下循于 内天府、侠白
穴；从侠白行少阴心主经脉之前，下行肘中尺泽穴；从尺泽循臂内上骨下廉孔最穴，从
孔最入寸口列缺、经渠、太渊穴；从太渊上鱼（句）入鱼际穴；从鱼际出大指之端少商
穴而终焉。其支者从腕后直出，循行次指内廉出其端，以交于手阳明大肠经也。
古籍记载：肺，是相傅之官（辅助君主的官员），治理和调节的功能由此产生。它的形状向下垂展，附着在脊柱第三椎体中间。有二十四个空窍，行列分布，用来运行各脏腑的气，作为五脏之长，作为心的覆盖物。又说：这条经脉通常多气少血。
《难经》说：肺重三斤三两，六叶两耳，共八叶，主要功能是藏魄。
《中藏经》说：肺是生气的源头，是五脏的华盖（像伞盖一样覆盖保护）。
张介宾说：肺叶洁白晶莹，称为华盖，因为它覆盖诸脏。空虚如同蜂巢，下面没有透气的孔窍，吸气时充满，呼气时虚空，一呼一吸，气息自然消长，主管清浊之气的运化，是人体像风箱一样的器官。
手太阴肺经的脉气，起始于中焦，向下联络大肠，回过来沿着胃的上口，向上穿过膈肌，归属于肺，从肺系（气管、喉咙等与肺相连的组织）横向走出腋下，向下沿上臂内侧，行在手少阴心经和手厥阴心包经的前面，下行至肘窝中，沿前臂内侧桡骨下缘，进入寸口（桡动脉搏动处），上行至大鱼际，沿鱼际边缘出于大拇指尖端；它的支脉，从腕后直出食指内侧边缘，出于其末端。
手太阴肺经从中焦生出，联络肠道，沿着胃散布流行，向上穿过膈肌归属于肺，从肺系横向走出腋下至肘中，沿手臂经过寸口、上至鱼际，在大拇指内侧指甲角端相通，支络又从腕后直出，沿食指内侧边缘出于其端，连接手阳明大肠经。
【注】手太阴肺经的脉气，起始于中焦，是指起始于任脉的中脘穴。向下联络大肠，回过来沿着胃的上口，是说本经的络脉，散布流行，向下则联络大肠，回上来而沿着胃的上口，并非直接向上穿过膈肌归属于肺的主干经脉。因为经络之气流行，循环往复没有尽头。所以手太阴肺经的脉气，必定从足厥阴肝经的支脉期门穴，循行至中脘穴，向上穿过膈肌归属于肺，从而交接手太阴肺经。从肺系横向走出腋下，到达中府、云门穴，向下沿上臂内侧的天府、侠白穴；从侠白穴行在手少阴心经和手厥阴心包经的前面，下行至肘中的尺泽穴；从尺泽穴沿前臂内侧桡骨下缘至孔最穴，从孔最穴进入寸口的列缺、经渠、太渊穴；从太渊穴上行至鱼际（句读停顿），进入鱼际穴；从鱼际穴出于大拇指尖端的少商穴而终结。它的支脉从腕后直出，循行于食指内侧边缘出于其端，以交接手阳明大肠经。
The classics state: The Lung is the official of the Prime Minister (Xiangfu), from which governance and regulation arise. Its shape hangs downward, attached to the middle of the third thoracic vertebra of the spine. There are twenty-four apertures, arranged in rows and distributed, to circulate the Qi of the various Zang organs; it is the chief of the Zang organs and the canopy of the Heart. It is also said that this meridian typically has abundant Qi and scarce Blood.
The *Nan Jing* (Classic of Difficult Issues) states: The Lung weighs three jin and three liang, has six lobes and two ears, totaling eight lobes, and primarily stores the Po (Corporeal Soul).
The *Zhong Zang Jing* (Classic of Internal Organs) states: The Lung is the root of generating Qi and serves as the Huagai (Canopy) of the five Zang organs.
Zhang Jiebin stated: The lung lobes are white and translucent, called the Huagai because they cover the other organs. Hollow like a bee's nest, with no perforations at the bottom, it fills upon inhalation and empties upon exhalation. With each breath, the Qi naturally expands and contracts, managing the transformation and transportation of clear and turbid substances, serving as the bellows of the human body.
The Hand-Taiyin Lung Meridian originates from the Middle Jiao, descends to connect with the Large Intestine, returns to follow the stomach opening, ascends through the diaphragm, and attaches to the Lung. From the Fei Xi (Lung system/trachea), it emerges horizontally into the axilla, descends along the medial aspect of the arm, running anterior to the Hand-Shaoyin Pericardium Meridian, descends into the cubital fossa, follows the medial forearm along the lower border of the radius, enters the Cun Kou (radial pulse area), ascends to the Thenar eminence, follows the Yu Ji (Fish Border) to exit at the tip of the thumb. Its branch emerges straight from behind the wrist along the medial side of the index finger, exiting at its tip.
The Hand-Taiyin Lung Meridian arises from the Middle Jiao, connects with the intestines, follows the stomach, and scatters and circulates. It ascends through the diaphragm, attaches to the Lung, emerges horizontally from the Lung system into the axilla to the elbow, follows the arm through Cun Kou, ascends to Yu Ji, communicates at the lateral nail corner of the thumb. The branch network emerges straight from behind the wrist, exits along the medial side of the index finger, connecting to the Hand-Yangming Large Intestine Meridian.
[Note] The Hand-Taiyin Lung Meridian originating from the Middle Jiao refers to originating from the Zhongwan (CV12) acupoint on the Ren Mai (Conception Vessel). Descending to connect with the Large Intestine and returning to follow the stomach opening means that the collateral vessels of this meridian scatter and circulate; descending, they connect with the Large Intestine, and ascending, they follow the stomach opening. This is not the direct pathway ascending through the diaphragm to attach to the Lung. Since meridian Qi circulates without beginning or end, the Hand-Taiyin Lung Meridian must necessarily travel from the branch of the Foot-Jueyin Liver Meridian at Qimen (LR14), proceed to Zhongwan (CV12), ascend through the diaphragm to attach to the Lung, thereby connecting with the Hand-Taiyin Lung Meridian. Emerging horizontally from the Lung system into the axilla leads to Zhongfu (LU1) and Yunmen (LU2); descending along the medial upper arm reaches Tianfu (LU3) and Xiabai (LU4); from Xiabai, running anterior to the Hand-Shaoyin and Hand-Jueyin meridians, it descends to Chi Ze (LU5) in the cubital fossa; from Chi Ze, following the medial forearm along the lower border of the radius reaches Kong Zui (LU6); from Kong Zui, entering Cun Kou, it passes Lie Que (LU7), Jing Qu (LU8), and Tai Yuan (LU9); from Tai Yuan, ascending to the Yu (Thenar Eminence), it enters Yu Ji (LU10); from Yu Ji, it exits at Shao Shang (LU11) at the tip of the thumb and ends. Its branch emerges straight from behind the wrist, travels along the medial side of the index finger, exits at its tip, and connects with the Hand-Yangming Large Intestine Meridian.