小肠后附于脊，前附于脐上，左回叠积十六曲。小肠上口，在脐上二寸近脊，水谷由此而入。复下
一寸，外附于脐，为水分穴，当小肠下口，至是而泌别清浊，水液渗入膀胱，滓秽流入大肠。引经报使
，用 本、黄柏。未时气血注于小肠。
手太阳经小肠脉，小指之端起少泽，〔在手小指外侧端。〕循手外廉出踝中，直循臂骨肘内侧，上循
外后廉行，直过宥解绕胛，交肩下入缺盆内，遂络心宫循咽喉，下膈抵胃属小肠，一支缺盆贯颈颊，
目锐 过却入耳，
〔目外角为目锐 。〕一支循颊走目下，抵鼻上至目内 。
〔目内角为目内 。〕斜络于颧太阳接。
膀胱当十九推，在肾之下，大肠之前。有下口，无上口。当脐上一寸水分穴处，为小肠下口
，乃膀胱上际。水液由此别回肠随气沁渗而入∶其出其入，皆由气化。入气不化，则水归
大肠，而为泄泻；出循不化，则闭塞下窍，而为癃肿。下连前阴，溺之所出。引经报使，用羌活。申
时气血注于膀胱。
足太阳经膀胱连，目内 起过额颠，支者从巅至耳角，〔至耳上角。〕直者从巅脑后悬，络脑
还出别下项，循肩膊内挟脊边，抵腰膂肾膀胱内，〔夹脊两旁之内曰膂。〕支者从腰下脊间，贯臀斜入
委中穴，〔在 中央。〕一支膊内左右别，〔后膊内左右别下贯胛。〕贯胛挟脊过髀枢，〔股骨曰髀
，髀之上曰髀枢，当环跳穴。〕循髀后廉 中合，〔膝后曲处曰 。〕下贯 内外跺后，遂循京骨指外侧。
〔足小指本节后大骨曰京骨。〕
小肠后方附着于脊柱，前方附着于肚脐上方，左侧回旋重叠堆积成十六个弯曲。小肠的上口，位于肚脐上方二寸处，靠近脊柱，饮食水谷由此进入。再向下延伸一寸，向外附着于肚脐，此处为水分穴，正对於小肠的下口，到达这里时，食物残渣与水液在此分离清浊，水液渗入膀胱，糟粕流入大肠。作为引经报使的药物，选用羌活、黄柏。未时气血灌注于小肠。
手太阳小肠经的脉气，起于手小指外侧端的少泽穴（位于手小指外侧端），沿手臂外侧边缘上行经过腕骨中部，直循前臂骨内侧肘部，向上沿上臂后外侧缘行走，直行经过腋窝下方，绕行肩胛部，交会于肩部，向下进入缺盆内，随后联络心脏，沿咽喉下行，穿过膈肌，抵达胃部，归属于小肠；一支脉从缺盆贯穿颈部和面颊，经过目外角后进入耳中；（目外角称为目锐眦）另一支脉沿面颊走向眼下，抵达鼻旁上行至目内角。（目内角称为目内眦）斜行络属于颧骨，与足太阳经相接。
膀胱位于第十九椎处，在肾脏之下，大肠之前。只有下口，没有上口。位于肚脐上一寸的水分穴处，这是小肠的下口，也是膀胱的上界。水液由此别出回肠，随着气化作用渗透而入：其进入和排出，都依赖于气化功能。如果入气不能气化，则水液归入大肠，导致泄泻；如果出窍的气化不通，则闭塞下部孔窍，导致小便癃闭或肿胀。膀胱下部连接前阴，是尿液排出的通道。作为引经报使的药物，选用羌活。申时气血灌注于膀胱。
足太阳膀胱经连属眼部内角起始，经过额顶，分支从头顶至耳上角；（至耳上角）直行者从头顶脑后悬垂而下，联络脑部，复出分别下行至项部，沿肩膊内侧挟持脊柱两旁，抵达腰部脊肉及肾脏、膀胱内部；（夹脊柱两旁内部的部位称为膂）分支从腰部下行至脊间，贯穿臀部斜入委中穴（位于腘窝中央）；一支脉从臂内侧左右分开，（向后臂内侧左右分开下行贯穿肩胛）贯穿肩胛挟持脊柱经过髀枢，（股骨称为髀，髀之上部称为髀枢，对应环跳穴），沿大腿后侧缘与腘窝相合，（膝后弯曲处称为腘）向下贯穿内外踝后方，随后沿京骨行至足小指外侧。（足小指本节后的大骨称为京骨）
The small intestine is attached posteriorly to the spine and anteriorly above the umbilicus, with its left side looping and stacking into sixteen curves. The upper orifice of the small intestine is located two cun above the umbilicus, near the spine, where food and fluids enter. Extending downward one cun further, it attaches externally to the umbilicus at the Shuifen (Water Division) acupoint, which corresponds to the lower orifice of the small intestine. Here, clear and turbid substances are separated: fluid permeates into the Bladder, while waste flows into the Large Intestine. For guiding the action of other herbs (Yin Jing Bao Shi), Qianghuo (Notopterygii Rhizoma et Radix) and Huangbai (Phellodendri Cortex) are used. Qi and blood flow into the Small Intestine during the Wei hour (13:00–15:00).
The meridian of the Hand-Taiyang Small Intestine begins at Shaose (Small Sea) [located at the ulnar end of the little finger], follows the lateral aspect of the hand through the wrist bone, runs straight along the medial side of the forearm bone and elbow, ascends along the posterolateral aspect of the arm, passes directly below the axilla, circles the scapula, crosses the shoulder, and enters the Supraclavicular Fossa (Quepen). It then connects with the Heart Palace, follows the throat, descends through the Diaphragm to reach the Stomach, and belongs to the Small Intestine. A branch from the Supraclavicular Fossa penetrates the neck and cheek, passes the outer canthus of the eye (Mu Ruizi), and enters the ear. Another branch follows the cheek to the area under the eye, reaches the nose, and ascends to the inner canthus of the eye (Mu Neizi). [The inner canthus is called Mu Neizi.] It obliquely connects to the Zygomatic bone, linking with the Foot-Taiyang meridian.
The Bladder is located at the level of the nineteenth thoracic vertebra, below the Kidneys and anterior to the Large Intestine. It has a lower orifice but no upper orifice. Its upper boundary is at the Shuifen acupoint, one cun above the umbilicus, which serves as the lower orifice of the Small Intestine. Fluids separate here from the Ileum and permeate in via Qi transformation. Both entry and exit depend on Qi transformation. If the entering Qi fails to transform, water returns to the Large Intestine, causing diarrhea; if the exiting pathway fails to transform, the lower orifices become blocked, leading to strangury or swelling. The lower part connects to the external genitalia, where urine exits. For guiding the action of other herbs (Yin Jing Bao Shi), Qianghuo (Notopterygii Rhizoma et Radix) is used. Qi and blood flow into the Bladder during the Shen hour (15:00–17:00).
The Foot-Taiyang Bladder meridian connects to the inner canthus of the eye, starts there, passes over the forehead and vertex. A branch goes from the vertex to the upper angle of the ear. [To the upper angle of the ear.] The main trunk hangs down from the vertex behind the head, connects to the Brain, emerges again, and separately descends to the nape. It follows the medial aspect of the shoulders, flanking the spine, reaching the lumbar region, spinal muscles, Kidneys, and Bladder internally. [The area internal to both sides of the spine is called Lü.] A branch descends from the waist between the vertebrae, penetrates the buttocks, and obliquely enters the Weizhong acupoint [located in the center of the popliteal fossa]. Another branch separates within the arm laterally, [descending laterally within the posterior arm through the scapula], penetrates the scapula, flanks the spine, passes the Hip Pivot (Bishu), [The femur is called Bi; the upper part of the Bi is called Bishu, corresponding to the Huantiao acupoint.], follows the posterior margin of the thigh, merges with the Popliteal Fossa (Gu), [The flexed area behind the knee is called Gu.], descends through the medial and lateral malleoli, and finally follows the Jinggu bone to the lateral side of the little toe. [The large bone after the base of the little toe is called Jinggu.]