（上焦，在心下下膈，胃之上口。其治在膻中，直两乳间陷者中。中焦，在胃中脘，当脐上
四寸，不上不下，其治在脐旁。下焦，当膀胱上口，其治在脐下一寸。皆水谷之道路，气之所终始也）《灵枢》
曰∶手少阳之脉，起于小指次指之端（关冲穴也），上出两指之间（即小指次指之间，液门、中渚穴也），循
手表腕（阳池穴也），出臂外两骨之间（外关、支沟等穴），上贯肘（天井穴也），循 外，上肩而交出足少
阳之后（ 外，行手太阳之前，手阳明之后，历清冷渊、消烁、 会，上肩 ，过足少阳之肩井，自天 而交
出足少阳之后也），入缺盆，布膻中，散络心包，下膈，循属三焦（其内行者，入缺盆，复由足阳明之外，下
布膻中，散络心包，相为表里，乃自上焦下膈，循中焦下行，并足太阳之正入络膀胱，以约下焦，故足太阳经委
阳穴，为三焦下辅俞也）；其支者，从膻中，上出缺盆，上项，系耳后，直上出耳上角，以屈下颊至 （其支
行于外者，自膻中上行出缺盆，循天 上项，会于督脉之大椎，循天牖，系耳后之翳风、螈脉、颅息，出耳上
角之角孙，过足少阳之悬厘、颔厌，下行耳、颊，至 ，会于手太阳颧 之分）；其支者，从耳后、入耳中，
出走耳前，过客主人前交颊，至目锐 （此支从耳后翳风入耳中，过手太阳之听宫，出走耳前之耳门，过足少
阳之客主人。交颊，循和 ，上丝竹空，至目锐 ，会于瞳子 穴，手少阳经止于此，而接乎足少阳经也）。
其别，名曰外关，去腕二寸，外绕臂，注胸中，合心主。病实则肘挛；虚则肘不收，而取之所别也（手少阳之
络，名外关，在腕后二寸两筋间，别走手厥阴心主者也。此经绕臂，故为肘挛及不收之病。治此者，当取所别
之外关）。其正，指天，别于巅，入缺盆，下走三焦，散于胸中也（三焦与心主，表里经脉相为一合。指天者，
天属阳，运于地之外。手少阳之正，上别于巅，入缺盆，下走三焦，散于胸中，包罗脏腑之外，故曰指天而言
也）。其筋起于小指次指之端，结于腕中，循臂结于肘，上绕 外廉，上肩走颈，合手太阳（小指次指之端，
无名指关冲穴也，上结于手腕之阳池，循臂外关、支沟之次，出臂上两骨间，结于肘，自肘上 外廉，由
会行太阳之里、阳明之外，上肩 ，走颈中天牖之分，与手太阳之筋合此，皆刚筋者也）；其支者，当曲颊入
系舌本（其支者，自颈中当曲颊下，入系舌本，与足太阳之筋合）；其支者，上曲牙，循耳前，属目外 ，上
乘颔，结于角（又支者，自颊行曲牙，会足阳明之筋，循耳前上行，与手太阳、足少阳之筋屈曲交绾，而会于
耳上之角孙，乃属目外 ，而复会于瞳子 之次。颔，当作额。盖此
筋自耳前行外 ，与三阳交会，上出两额之左右，以结于额
之上角也）。是动则病耳聋浑浑 ，嗌肿喉痹。是主气所生病者，目锐 痛，颊痛，耳后肩 肘臂外皆痛，
小指次指不用。盛者人迎大一倍于寸口，虚者人迎反小于寸口也。又曰∶三焦各有所出，上焦出于胃口，上并
咽，以上贯膈，而布胸中，走腋，循太阴之分而行，还至阳明，上至舌下。足阳明常与营俱行于阳二十五度，
行于阴亦二十五度，一周也，故五十度而复会于手太阴。中焦亦并胃中，出上焦之后，此所受气者泌糟粕，蒸
津液，化其精微，上注于肺脉，乃化而为血，以奉生身，莫贵于此，故独得行于经隧，命曰营气。下焦者，别
回肠，注于膀胱而渗入焉。故水谷者，常并居于胃中，成糟粕，而俱下于大肠，而成下焦，渗而俱下，济泌别
汁，随下焦而渗入膀胱焉。《难经》曰∶上焦主内而不出，中焦主腐熟水谷，下焦主分别清浊，出而不内，以
传导。《素问》曰∶上焦如雾（气也），中焦如沤（血也），下焦如渎（传导也）。张洁古曰∶雾不利而为喘
满，沤不利而为留饮，渎不利而为肿胀。王海藏曰∶头至心为上焦，心至脐为中焦，脐至足为下焦。三焦有脏
而无腑，其腑在气街中冲脉是也。
又曰∶手有三焦（不言所在），主持乎上；足有三焦（自脐下膀胱主足），主持乎下。右手尺脉为命门，
与心包络脉同诊，亦有三焦之称，为命门之火，游行于五脏之间，主持乎内；三焦通为一气，卫于一身，为外
护，主持乎外。
（上焦，位于心下、横膈膜之上，胃的上口处。其治疗部位在膻中穴，即两乳之间凹陷的中心。中焦，位于胃的中脘部，肚脐上方四寸处，位置处于上下之间，其治疗部位在肚脐旁。下焦，位于膀胱的上口处，其治疗部位在肚脐下一寸处。这三者都是水谷运行的通道，也是气机终结和起始的地方。）《灵枢》说：手少阳三焦经的经脉，起于无名指末端（关冲穴），向上出于无名指与小指之间（即无名指与小指之间，液门穴、中渚穴所在处），沿着手背腕部（阳池穴），出于前臂外侧两根骨头之间（外关穴、支沟穴等穴位所在处），向上穿过肘部（天井穴），沿着手臂外侧，向上经过肩部并交叉走在足少阳胆经之后（此处行于手太阳小肠经之前，手阳明大肠经之后，经过清冷渊、消泺、臑会穴，上至肩部，经过足少阳胆经的肩井穴，从天髎穴出来交叉走在足少阳胆经之后），进入缺盆，散布于膻中，散络于心包，向下穿过横膈膜，依次隶属上、中、下三焦（其内部行走的经脉，进入缺盆后，又由足阳明胃经的外侧，向下散布于膻中，散络于心包，二者互为表里，于是从上焦向下穿过横膄，沿着中焦下行，并与足太阳膀胱经的正脉一起入络膀胱，以约束下焦，所以足太阳经的委阳穴，是三焦的下辅俞穴）；它的分支，从膻中向上出于缺盆，上行至颈部，联系耳后，直上出于耳上角，然后弯曲下行至颊部至颧骨处（其分支向外行走的路线，从膻中上行出缺盆，循天髎穴上至颈部，会合于督脉的大椎穴，循天牖穴，联系耳后的翳风穴、颧脉、颅息穴，出于耳上角的角孙穴，经过足少阳胆经的悬厘穴、颔厌穴，下行经过耳部和颊部，至颧骨处，会合于手太阳小肠经的颧髎穴分部）；另一分支，从耳后进入耳中，走出耳前，经过客主人穴前方交叉于颊部，至目外眦（此分支从耳后翳风穴进入耳中，过手太阳小肠经的听宫穴，走出耳前的耳门穴，过足少阳胆经的客主人穴。交叉于颊部，循和髎穴，上至丝竹空穴，至目外眦，会合于瞳子髎穴，手少阳三焦经终止于此，接着连接足少阳胆经）。它的别络，名叫外关，距离腕部二寸，向外环绕手臂，注入胸中，与心主（心包）相合。病证表现为实证则肘部拘挛；虚证则肘部不能收持，应当取用该别络所出的穴位进行治疗（手少阳的络脉，名叫外关，在腕后二寸两筋之间，别走手厥阴心包经。这条经脉环绕手臂，所以会导致肘部拘挛及不能收持的病证。治疗这些病症，应当取用别出的外关穴）。其正脉，指向天空，从头顶分出，进入缺盆，向下走向三焦，散布于胸中（三焦与心包，表里经脉相互结合为一。所谓“指天”，是因为天属阳，运行于地之外。手少阳的正脉，向上别出于头顶，进入缺盆，向下走向三焦，散布于胸中，包裹脏腑之外，所以说是指天而言）。其筋起于无名指末端，结聚于腕部，沿着手臂结聚于肘部，向上环绕手臂外侧廉，上肩走颈，与手太阳经相合（无名指末端即关冲穴，向上结聚于手腕的阳池穴，循行于手臂外关、支沟穴的旁边，出于前臂上两骨之间，结聚于肘部，自肘部向上沿手臂外侧廉，由臑会穴行于手太阳经的里面、手阳明经的外面，上肩，走颈部天牖穴的分部，与手太阳经的筋相合，这些都是刚硬的筋）；其分支，在曲颊下方进入并联系舌根（其分支，从颈部曲颊下方进入，联系舌根，与足太阳经的筋相合）；另一分支，上行至曲牙穴，循行耳前，属于目外眦，上乘额部，结聚于额角（又一分支，从颊部行至曲牙穴，会合足阳明经的筋，循行耳前上行，与手太阳、足少阳经的筋屈曲交缠，而会合于耳上的角孙穴，乃属于目外眦，而复会合于瞳子髎穴附近。这里的“颔”字，应当作“额”。因为这条筋从耳前行于外眦，与三阳经交会，上出左右两额，以结聚于额之上角）。当经脉发生变动时，会出现耳聋、声音浑浊、咽喉肿痛、喉痹等症状。本经主治气分病变引起的疾病，如目外眦疼痛、颊痛、耳后、肩、肘、臂外侧均疼痛，无名指和小指不能活动。脉象方面，实证时人迎脉比寸口脉大一倍，虚证时人迎脉反而小于寸口脉。又说：三焦各有其出处，上焦出于胃口，向上并行于咽部，以上穿过横膈，而散布于胸中，走向腋下，循行于太阴经的分部而行，返回至阳明经，上至舌下。足阳明胃经常与营气一起行于阳分二十五周次，行于阴分也是二十五周次，这是一周，所以五十周次后又重新会合于手太阴肺经。中焦也并行于胃中，出自上焦之后，这里所受纳的气，泌别糟粕，蒸化津液，转化其中的精微物质，向上注入肺脉，进而化生为血液，以供养身体，没有比这更宝贵的了，所以只有它能行于经脉隧道之中，命名为营气。下焦，分别回肠，注入膀胱并渗入其中。所以水谷，常常共同居住在胃中，变成糟粕，一起下行进入大肠，形成下焦的功能，渗泄而下，过滤分别汁液，随着下焦的功能渗入膀胱。《难经》说：上焦主管受纳而不排出，中焦主管腐熟水谷，下焦主管分别清浊，排出而不纳入，起到传导作用。《素问》说：上焦像雾露一样（指气的宣发），中焦像沤渍一样（指血的化生），下焦像沟渠一样（指传导排泄）。张洁古说：如果雾（上焦之气）不利就会发生喘满，沤（中焦之血）不利就会发生留饮，渎（下焦之水道）不利就会发生肿胀。王海藏说：头部到心脏为上焦，心脏到肚脐为中焦，肚脐到脚为下焦。三焦有脏而无腑，其腑位于气街中的冲脉。又说：手有三焦（不说具体位置），主持上部功能；足有三焦（从肚脐下膀胱主导足部功能），主持下部功能。右手尺脉对应命门，与心包络脉同时诊察，也有三焦之称，作为命门之火，游行于五脏之间，主持内部功能；三焦通为一气，护卫一身，作为外部保护，主持外部功能。
[Upper Jiao] is located below the heart, above the diaphragm, and at the upper opening of the stomach. Its treatment site is at Tanzhong (Chest Center), which is in the center of the depression between the two breasts. [Middle Jiao] is located at Zhongwan (Middle Stomach) in the stomach, four cun above the umbilicus, positioned midway between up and down. Its treatment site is beside the umbilicus. [Lower Jiao] is located at the upper opening of the bladder, and its treatment site is one cun below the umbilicus. (The three jiaos are all pathways for water and grain, and are where qi begins and ends.)
*Ling Shu* states: The Hand-Shaoyang Sanjiao Meridian originates at the tip of the fourth finger (Guanchong, SI 16), ascends out between the fourth and fifth fingers (i.e., between the ring and little fingers, where Yemen, TE 2, and Zhongzhu, TE 3 are located), follows the dorsal aspect of the hand to the wrist (Yangchi, TE 4), emerges between the two bones of the forearm (Waiguan, TE 5, Zhigou, TE 6, etc.), ascends through the elbow (Tianjing, TE 10), follows the lateral aspect of the arm, ascends to the shoulder, and crosses behind the Foot-Shaoyang Gallbladder Meridian (here it runs anterior to the Hand-Taiyang Small Intestine Meridian and posterior to the Hand-Yangming Large Intestine Meridian, passing Qinglengyuan, Xiaoluo, Naohui, ascends to the shoulder, passes Jianjing, GB 21 of the Foot-Shaoyang Gallbladder Meridian, exits from Tianliao, and crosses behind the Foot-Shaoyang Gallbladder Meridian), enters the supraclavicular fossa (Quepen), distributes in Tanzhong, scatters and connects with the Pericardium, descends through the diaphragm, and successively belongs to the Upper, Middle, and Lower Jiao (Its internal branch enters the supraclavicular fossa, then goes down along the lateral side of the Foot-Yangming Stomach Meridian, distributes in Tanzhong, scatters and connects with the Pericardium, forming a interior-exterior relationship; thus descending from the Upper Jiao through the diaphragm, following the Middle Jiao downward, joining the main channel of the Foot-Taiyang Bladder Meridian to connect with the bladder, thereby regulating the Lower Jiao. Therefore, Weiyang, BL 39 of the Foot-Taiyang Meridian is the lower auxiliary shu point of the Sanjiao); its branch arises from Tanzhong, ascends out of the supraclavicular fossa, goes up to the neck, connects behind the ear, goes straight up to emerge above the ear apex, then curves down to the cheek and zygomatic area (its external branch ascends from Tanzhong out of the supraclavicular fossa, follows Tianliao up to the neck, meets Dazhui, GV 14 of the Du Meridian, follows Tianyou, connects Yifeng, TE 17, Hui, TE 18, and Luxi, TE 19 behind the ear, emerges at Jiaosun, TE 14 above the ear apex, passes Xuanli, GB 7 and Hanyan, GB 6 of the Foot-Shaoyang Gallbladder Meridian, descends past the ear and cheek to the zygomatic area, meeting the distribution of Yinggu, SI 9 of the Hand-Taiyang Small Intestine Meridian); another branch enters the ear from behind the ear, exits in front of the ear, crosses anterior to the cheek at the point before Keyuzhuren, and reaches the outer canthus (this branch enters the ear from Yifeng, TE 17 behind the ear, passes Tinggong, SI 19 of the Hand-Taiyang Small Intestine Meridian, exits in front of the ear at Ermen, TE 21, passes Keyuzhuren of the Foot-Shaoyang Gallbladder Meridian. Crossing the cheek, it follows Heliao, TE 18, ascends to Sizhukong, TE 23, and reaches the outer canthus, meeting Tongziliao, GB 1. The Hand-Shaoyang Sanjiao Meridian ends here and connects to the Foot-Shaoyang Gallbladder Meridian).
Its collateral is named Waiguan, two cun from the wrist, winds around the arm externally, injects into the chest, and merges with the Heart Master (Pericardium). Pathological conditions manifest as stiffness of the elbow in excess patterns; flaccidity of the elbow in deficiency patterns. Treatment should target the point where this collateral branches off (The collateral of the Hand-Shaoyang Sanjiao is named Waiguan, located two cun behind the wrist between two tendons, branching to the Hand-Jueyin Pericardium Meridian. Since this meridian winds around the arm, it causes diseases of elbow stiffness and inability to flex. To treat these, one should select Waiguan, the point where it branches). Its regular pathway points upward toward heaven, diverges at the vertex, enters the supraclavicular fossa, descends to the Sanjiao, and scatters in the chest (The Sanjiao and the Pericardium form an interior-exterior pair. "Pointing to heaven" refers to the fact that heaven belongs to Yang and operates outside the earth. The regular pathway of the Hand-Shaoyang Sanjiao ascends and diverges at the vertex, enters the supraclavicular fossa, descends to the Sanjiao, and scatters in the chest, encompassing the exterior of the zang-fu organs; hence it is described as "pointing to heaven").
Its sinews originate at the tip of the fourth finger, knot at the wrist, follow the arm to knot at the elbow, wind around the lateral aspect of the elbow, ascend to the shoulder, and travel to the neck, merging with the Hand-Taiyang Meridian (The tip of the fourth finger is Guanchong, TE 1, ascending to knot at Yangchi, TE 4 of the wrist, following the path of Waiguan, TE 5, and Zhigou, TE 6 on the arm, emerging between the two bones of the forearm, knotting at the elbow, winding around the lateral edge of the elbow from Naohui, running inside the Hand-Taiyang and outside the Hand-Yangming, ascending to the shoulder, traveling to Tianyou in the neck, and merging with the sinews of the Hand-Taiyang Meridian; these are all firm sinews); its branch enters at the angle of the jaw and connects to the root of the tongue (its branch descends from the neck at the angle of the jaw, enters to connect to the root of the tongue, merging with the sinews of the Foot-Taiyang Meridian); another branch ascends to Quya, follows the front of the ear, attaches to the outer canthus, rides over the mandible/maxilla, and knots at the corner of the forehead (another branch travels from the cheek to Quya, meets the sinews of the Foot-Yangming Meridian, follows the front of the ear upward, intersects and intertwines with the sinews of the Hand-Taiyang and Foot-Shaoyang Meridians, and meets at Jiaosun, TE 14 above the ear, then attaches to the outer canthus and meets again near Tongziliao, GB 1. Here, "han" should be read as "e" (forehead). For this tendon travels from the ear forward to the outer canthus, intersects with the three yang meridians, ascends to emerge at the left and right foreheads, and knots at the upper corner of the forehead).
When the meridian is disturbed, it causes deafness with muffled hearing, swelling of the throat, and throat obstruction. It governs diseases arising from qi, such as pain at the outer canthus, cheek pain, pain in the ear, shoulder, elbow, and lateral aspect of the arm, and dysfunction of the fourth and fifth fingers. In excess conditions, the Renying pulse is one times larger than the Cunkou pulse; in deficiency conditions, the Renying pulse is smaller than the Cunkou pulse.
It is also said: The three jiaos each have their origin. The Upper Jiao originates from the stomach opening, ascends along the pharynx, penetrates the diaphragm, distributes in the chest, travels to the axilla, follows the Taiyin division, returns to the Yangming, and ascends to below the tongue. The Foot-Yangming Stomach Meridian often travels with Ying Qi (Nutritive Qi) twenty-five degrees in the Yang levels and twenty-five degrees in the Yin levels, completing one cycle; thus, after fifty degrees, it reunites with the Hand-Taiyin Lung Meridian. The Middle Jiao is also within the stomach, emerging after the Upper Jiao. The qi received here separates dregs, steams fluids, transforms them into essence, which flows upward into the lung vessels, transforming into blood to nourish the body. Nothing is more precious than this, so only it travels through the meridians, hence named Ying Qi (Nutritive Qi). The Lower Jiao separates the ileum, pours into the bladder, and seeps in. Thus, water and grain commonly reside in the stomach, become dregs, and descend together to the large intestine, forming the function of the Lower Jiao, filtering and separating juices, which descend with the Lower Jiao into the bladder.
*Nan Jing* states: The Upper Jiao governs intake without excretion; the Middle Jiao governs the rotting and ripening of food and drink; the Lower Jiao governs the separation of clear and turbid, excreting without intake, serving as conduction. *Su Wen* states: The Upper Jiao is like mist (referring to Qi); the Middle Jiao is like fermentation/bubbles (referring to Blood/transformation); the Lower Jiao is like a ditch (referring to conduction/drainage). Zhang Jiegu stated: If the mist is not unobstructed, it leads to wheezing and fullness; if the fermentation is not unobstructed, it leads to retained fluid; if the ditch is not unobstructed, it leads to swelling. Wang Haizang stated: From the head to the heart is the Upper Jiao; from the heart to the umbilicus is the Middle Jiao; from the umbilicus to the feet is the Lower Jiao. The Sanjiao has Zang aspects but no Fu organ; its Fu aspect is located in the Chong Mai (Penetrating Vessel) at the Qijie (Street of Qi).
It is also said: There is Hand Sanjiao (location unspecified), which governs the upper part; there is Foot Sanjiao (governed by the bladder below the umbilicus for the lower limbs), which governs the lower part. The Chi pulse of the right hand corresponds to Mingmen (Gate of Life), diagnosed together with the Pericardium Collateral Meridian, also bearing the name Sanjiao, acting as the Fire of Mingmen, roaming among the five Zang organs, governing internal functions; the Sanjiao integrates into a single Qi, guards the whole body, acting as external protection, governing external functions.