（重九两二铢，纵横九寸，居肾下之前，大肠之侧，当脐上一寸水分穴之处、小肠下口，乃
膀胱上际也，水液由是渗入焉）。《灵枢》曰∶足太阳之脉，起于目内 ，上额交巅（其脉起于睛明穴，由攒
竹上额历曲差、五处等穴，自络却穴左右斜行，而交于顶巅之百会），其支者，从巅至耳上角（其支者，由百
会旁行，至耳上角，过足少阳之曲鬓、率谷、天冲、浮白、窍阴、完骨，此皆为足太阳、少阳之会）；其直者，
从巅入络脑（自百会行通天、络却、玉枕，入络于脑中也），还出别下项，循肩膊内，挟脊抵腰中（自脑后复
出，别下项，由天柱而下会于督脉之大椎、陶道，却循肩膊内，分作四行而下，此节言内两行者，挟脊两旁，
各相去一寸半，自大杼行风门，及脏腑诸俞，而抵腰中等穴。中行椎骨曰脊。臀骨曰腰），入循膂，络肾，
属膀胱（自腰中入膂络肾，前属膀胱，为表里也。挟脊两旁之肉曰膂）；其支者，从腰中下挟脊，贯臀，入
中（从腰中循髋骨下挟脊，历四 穴，贯臀之会阳，下行承扶、殷门、浮 、委阳，入 之委中也。尻旁大
骨曰臀。膝后曲处曰 ）；其支者，从 内左右，别下贯胛，挟脊内（此支言肩膊内大杼下，外两行也，左右
贯胛，去脊各三寸别行，历附分、魄户、膏肓等穴，挟脊下行，由秩边而过髀枢也），过髀枢，循髀外，从后
廉下合 中（过髀枢，会于足少阳之环跳，循髀外后廉，去承扶一寸五分之间，下行复与前之入 中者相合），
以下贯 内，出外踝之后，循京骨，至小趾外侧端（贯 内者，由合阳以下承筋、承山等穴也。出外踝之后，
乃昆仑、仆参等穴也。小趾本节后大骨曰京骨，而小趾外侧之端曰至阴，足太阳经穴止此，乃交于小趾之下，
而接于足少阴经也）。其别，名曰飞扬，去踝七寸，别走少阴。实则鼽窒，头背痛；虚则鼽衄，取之所别也
（足太阳之络，名飞扬，在足外踝上七寸，别走足少阴者也。此经起于目内 ，络脑，行头背，故其为病如此。
治此者，当取所别之飞扬）。其正，别入于 中，其一道下尻五寸，别入于肛，属于膀胱，散之肾，循膂当心
入散；直者，从膂上出于项，复属于太阳，此为一经（此膀胱与肾为表里，故其经脉相为一合也。足太阳之正，
入中，与少阴合而上行，其别一道下尻五寸，当承扶之次，上入肛门，内行腹中，属于膀胱，散于肾，循膂
当心入散，上出于项，而复属于本经太阳，此内外同为一经也）。其筋起于足小趾，上结于踝，斜上结于膝（足
太阳之筋，即其经脉所止之处，至阴穴次也。循足跗外侧，上结于外踝昆仑之分，乃斜上附阳而结膝 之分。
结，聚也），其下循足外踝，结于踵；上循跟，结于 （其下，足跗之下也。踵，即足跟之突出者。跟，即踵
上之硬筋处，乃仆参、申脉之分，结于 之委中穴也）；其别者，结于 外，上 中内廉，与 中并（此即大
筋之旁出者，别为柔软短筋，亦犹木之有枝也。凡言别者、支者皆仿此。此支自外踝别行，由足 肚之下尖处，
行少阳之后，结于 之外侧络穴飞扬之分，乃上 内廉，合大筋于委中而一之也），上结于臀（尾 之旁，会
阳之分也），上挟脊上项（挟脊背分，左右上项，会于督脉之陶道、大椎，此皆附脊之刚筋也）；其支者，别
入结于舌本（其支者，自项别入内行，与手少阳之筋结于舌本，散舌下。自此以上，皆柔软之筋，而散于头面）；
其直者，结于枕骨，上头下颜，结于鼻（其直，自项而上，与足少阴之筋合于脑后枕骨间，由是而上过于头，
前下于颜，以结于鼻下之两旁。额上曰颜也）；其支者，为目上网，下结于 （网，纲维也，所以约束目捷，
司开阖者也。目下曰 ， 即颧也。此支自通顶入脑者下属目本，散于目上，为目上网，下行者结于 ，与足
少阳之筋
合），其支者，从腋后外廉，结于肩 （又其支者，从挟脊循腋后外廉，行足少阳之后，上至肩，会手阳明之
筋，结于肩 ）；其支者，入腋下，上出缺盆，上结于完骨（此支后行者，从腋后走腋下，向前斜出阳明之
缺盆，乃从耳后直上，会手太阳、足少阳之筋，结于完骨。完骨，耳后高骨也）；其支者，出缺盆，斜上出于
（此支前行者，同前缺盆之筋岐出，别上颐颔，斜行出于 ，与前之下结于 者相合也）。是动则病冲头痛，
目似脱，项似拔，脊痛，腰似折，髀不可以曲， 如结， 如裂，是为踝厥。是主筋所生病者，痔疟狂癫疾，
头囟顶痛，目黄，泪出鼽衄，项背腰尻 脚皆痛，小指不用。盛者人迎大再倍于寸口，虚者人迎反小于寸口也。
(The Bladder [Pangguang] weighs nine taels and two zhu, is nine cun in length and width, located anterior to the Kidney [Shen] and lateral to the Large Intestine [Dachang], corresponding to the Shuifen (CV9) acupoint one cun above the umbilicus, at the lower opening of the Small Intestine [Xiaochang], which is the upper boundary of the Bladder; fluids seep into it from here). The *Ling Shu* states: The Foot-Taiyang Bladder Meridian [Zu Taiyang Pangguang Jing] originates at the inner canthus of the eye [Neicuo], ascends to the forehead, and intersects at the vertex [Dian] (The meridian starts at the Jingming (BL1) acupoint, ascends from the Cuanzhu (BL2) point to the forehead, passing through Qucha (BL7), Wuchu (BL8), etc., and from the Luoque (BL9) point runs obliquely to the left and right, intersecting at Baihui (GV20) on the vertex); its branch [Zhi] extends from the vertex to the upper angle of the ear (This branch runs laterally from Baihui to the upper angle of the ear, passing through Qubin (GB6), Lvgu (GB5), Tianchong (GB4), Fu Bai (GB3), Qiaoyin (GB10), and Wanggu (GB12) of the Foot-Shaoyang Gallbladder Meridian [Zu Shaoyang Dan Jing]; these are all intersection points of the Foot-Taiyang and Foot-Shaoyang meridians); its main trunk [Zhi Zhe] enters the head from the vertex to connect with the brain [Nao] (From Baihui, it passes through Tongtian (BL7), Luoque (BL9), and Yuzhen (BL11), entering and connecting within the brain), emerges again, descends separately to the nape [Xiang], follows the interior of the shoulder blade [Jianbo], and reaches the waist [Yao] along both sides of the spine [Ji] (Emerging from behind the head, it descends separately to the nape, meeting Dazhui (GV14) and Daodao (GV13) of the Governor Vessel [Du Mai] via Tianzhu (BL10), then follows the interior of the shoulder blades, dividing into four rows descending; the two inner rows mentioned here run alongside the spine, each 1.5 cun apart, passing from Dashu (BL11) through Fengmen (BL12) and various Back-Shu points of the Zang-Fu organs, reaching the waist, etc. The vertebral column in the center is called Ji. The pelvic bone is called Yao), enters the paraspinal muscles [Lv], connects with the Kidney, and belongs to the Bladder (Entering the paraspinal muscles from the waist to connect with the Kidney, it belongs anteriorly to the Bladder, forming a exterior-interior relationship. The flesh on both sides of the spine is called Lv); its branch descends from the waist, running alongside the spine, penetrating the buttocks [Tun], and entering the popliteal fossa [Zhong] (Descending from the waist along the hip bone alongside the spine, passing through Chengfu (BL36), Yinmen (BL37), Fupi (BL38), Weiyang (BL39), and entering Weizhong (BL40) in the popliteal fossa. The large bone beside the sacrum is called Tun. The bend behind the knee is called Zhong); another branch arises from the medial side of the popliteal fossa, descends separately to penetrate the scapula, and runs inside the spine (This branch refers to the outer two rows below Dashu in the shoulder blade region, penetrating the scapula on both sides, three cun away from the spine, passing through Fufen (BL43), Pohu (BL42), Gaohuang (BL44), etc., descending alongside the spine, passing Zhizhong (BL54) over the greater trochanter [Bishu]), passes the greater trochanter, follows the lateral aspect of the thigh [Bi], and joins the popliteal fossa from the posterior margin (Passing the greater trochanter, it meets Huantiao (GB30) of the Foot-Shaoyang Gallbladder Meridian, follows the posterior-lateral margin of the thigh, between 1.5 cun distal to Chengfu, descends, and joins those previously entering the popliteal fossa), then penetrates the calf [Cheng], emerges posterior to the lateral malleolus [Waihuai], follows Jinggu (BL64), and ends at the lateral tip of the little toe [Xiaozhi] (Penetrating the calf involves points from Heyang (BL57) downwards such as Chengjin (BL56) and Chengshan (BL58). Emerging posterior to the lateral malleolus involves Kunlun (BL60) and Pucan (BL61). The large bone after the base of the little toe is called Jinggu, and the lateral tip of the little toe is called Zhiyin (BL66); Foot-Taiyang meridian points end here, connecting below the little toe to the Foot-Shaoyin Kidney Meridian [Zu Shaoyin Shen Jing]). Its collateral [Bie] is named Feiyang (BL58), seven cun from the ankle, diverging to the Shaoyin. In excess conditions, there is nasal obstruction and headache/back pain; in deficiency conditions, there is rhinorrhea or epistaxis; treatment should target this divergent point (The collateral of the Foot-Taiyang is named Feiyang, located seven cun above the lateral malleolus, diverging to the Foot-Shaoyin. This meridian originates at the inner canthus, connects to the brain, and travels the head and back, hence these symptoms. To treat this, one should select the divergent point Feiyang). Its main pathway enters the popliteal fossa; one branch descends five cun from the sacrum, enters the anus [Gang], belongs to the Bladder, disperses in the Kidney, follows the paraspinal muscles towards the heart [Xin] to disperse; the straight path ascends from the paraspinal muscles to the nape, re-attaching to the Taiyang, constituting one meridian (The Bladder and Kidney are exterior-interior pairs, so their meridians form a union. The proper Foot-Taiyang enters the popliteal fossa, merging with the Shaoyin to ascend; its divergent branch descends five cun from the sacrum, near Chengfu, enters the anus, travels internally in the abdomen, belongs to the Bladder, disperses in the Kidney, follows the paraspinal muscles towards the heart to disperse, ascends out to the nape, and re-attaches to the original Taiyang meridian, representing one internal-external unit). Its sinews [Jin] originate at the little toe, bind upwards at the ankle, and slant upwards to bind at the knee (Foot-Taiyang sinews correspond to the termination of the meridian, next to Zhiyin. Following the lateral dorsum of the foot, they bind at the lateral malleolus near Kunlun, then slant up to Fuyang and bind at the popliteal region. 'Bind' means gather); the lower part follows the lateral malleolus and binds at the heel [Zhong]; the upper part follows the Achilles tendon [Gen] and binds at the popliteal fossa (The lower part is below the dorsum of the foot. Zhong is the prominent part of the heel. Gen is the hard tendon above the Zhong, corresponding to Pucan and Shenmai, binding at Weizhong in the popliteal fossa); its divergent part binds at the lateral side of the popliteal fossa, ascends along the medial margin of the popliteal fossa, and merges with Weizhong (This is a soft short tendon branching from the large tendon, like branches on a tree. All 'divergent' or 'branch' descriptions follow this pattern. This branch diverges from the lateral malleolus, passes under the calf apex, runs posterior to the Shaoyang, binds at the lateral collateral point Feiyang, ascends along the medial margin of the popliteal fossa, and unites with the large tendon at Weizhong), ascends to bind at the buttocks (Beside the coccyx, at Hu yang), ascends to flank the spine and reach the nape (Flanking the dorsal spine, ascending bilaterally to the nape, meeting Tao Dao and Dazhui of the Du Mai; these are strong sinews attached to the spine); its branch enters separately to bind at the root of the tongue [Sheben] (This branch diverges from the nape, travels internally, binds with the Hand-Shaoyang Sanjiao Meridian sinews at the root of the tongue, and disperses under the tongue. Above this, all are soft sinews dispersing in the head and face); the straight path binds at the occipital bone [Zhen Gu], goes over the head to the face [Yan], and binds at the nose (The straight path ascends from the nape, combines with Foot-Shaoyin sinews at the occiput, goes over the head, descends anteriorly to the face, binding at both sides below the nose. The forehead is called Yan). Its branch forms the upper eyelid net [Mu Shangwang], binding downward at the cheekbone [Quan] (Net refers to the ligamentous structure constraining the eyeball, governing opening and closing. Below the eye is Quan, i.e., the zygomatic bone. This branch descends from the brain connection to the eye root, disperses above the eye as the upper eyelid net, and descends to bind at Quan, combining with Foot-Shaoyang sinews); its branch from the posterior-lateral axilla binds at the shoulder [Jian] (Another branch follows the spine-flanking path to the posterior-lateral axilla, runs posterior to Foot-Shaoyang, ascends to the shoulder, meets Hand-Yangming sinews, and binds at the shoulder); its branch enters the axilla [Ye Xia], ascends out of the supraclavicular fossa [Quepen], and binds at Wanggu (This posterior branch moves from the posterior axilla to the axilla,斜wardly exits Yangming's Quepen, then ascends straight from behind the ear, meeting Hand-Taiyang and Foot-Shaoyang sinews, binding at Wanggu. Wanggu is the high bone behind the ear); its branch emerges from Quepen, slants upward to the mandible [Yu Han] (This anterior branch diverges from Quepen sinews, ascends to the chin/jaw, slants out to Yu Han, joining the previous branch binding at Quan). When this meridian is disturbed, disease manifests as rushing headache, eyes feeling as if protruding, neck feeling as if pulled, spinal pain, waist feeling as if broken, inability to flex the thigh, popliteal fossa feeling knotted, calf feeling torn, known as An Jue (Ankle Jue). This meridian governs diseases of the sinews: hemorrhoids, malaria, mania/epilepsy, vertex/headache, yellow eyes, lacrimation, nasal obstruction/epistaxis, pain in the neck, back, waist, sacrum, and feet, and dysfunction of the little toe. In excess, the Renying pulse is twice as large as the Circumference Mouth (Cunkou) pulse; in deficiency, the Renying pulse is smaller than Cunkou.]