（左右各一枚，状如石卵，色黑紫，当胃下两旁，入脊膂，附脊之第十四椎，前后与脐平直）
《灵枢》曰∶足少阴之脉，起于小趾之下，斜走足心（涌泉穴也），出于然谷之下，循内踝之后，别入跟中（然
谷，穴名，在内踝前起大骨下陷中。内踝后别入跟中，即太溪、太钟等穴），以上 内，出 内廉（自复溜、
交信，过足太阴之三阴交，以上 内之筑宾，出 内廉之阴谷），上股内后廉，贯脊属肾络膀胱（上股内后廉，
结于督脉之长强，以贯脊中，而后属于肾，前当关元、中极之分，而络于膀胱也。滑氏曰∶由阴谷上股内后廉，
贯脊，会于脊之长强穴，还出于前，循横骨、大赫、气穴、四满、中注、肓俞，当肓俞之所、脐之左右属肾，
下脐过关元、中极而络膀胱也）；其直者，从肾上贯肝膈，入肺中，循喉咙，挟舌本（滑氏曰∶其肓俞属肾处
上行，循商曲、石关、阴都、通谷诸穴，贯肝，上循幽门，上膈，历步廊入肺中，循神封、灵藏、 中、俞府，而上
循喉咙，并人迎，挟舌本而终）；其支者，从肺出络心，注胸中（其支者，自神藏之次，从肺络心，注胸中。
以上俞府诸穴，足少阴经止于此，而接乎手厥阴也。胸中，当两乳之间，亦曰膻中）。其别，名曰大钟，当
踝后绕跟，别走太阳；其别者，并经上走于心包，下外贯腰脊。其病气逆则烦闷，实则闭癃，虚则腰痛，取
之所别也（足少阴之络，名大钟，在足跟后骨上两筋间，别走足太阳者也。言本经从肺出络心，此言上走心包，
下外贯腰脊，故其为病如此。凡治此当取所别之大钟也）。其正，至 中，别走太阳而合，上至肾，当十四椎，
出属带脉；直者，系舌本，复出于项，合于太阳，此为一合，成以诸阴之别，皆为正也（此膀胱与肾为表里，
故其经脉相为一合。足少阴之正，自 中合于太阳，内行上至肾，当十四椎旁肾俞之次，出属带脉；其直者，
上系舌本，复出于项，合于太阳，是为六合之一。然有表必有里，诸阳之正，必成于诸阴之别，非旁通交会也）。
其筋起于小趾之下，并足太阴之筋，斜走内踝之下，结于踵，与太阳之筋合，而上结于内辅之下（足少阴之筋，
起小趾下，斜趋足心；又斜趋内侧，上然谷，并足太阴商丘之次，走内踝之下，结于跟踵之间，与太阳之筋合，
由踵内侧上行，结于内辅骨下阴谷之次），并太阴之筋而上循阴股，结于阴器（自内辅骨下，并太阴之筋，上
循阴股，上横骨与太阴、厥阴、阳明之筋合，而结于阴器者，皆刚筋也），循脊内挟膂上至项，结于枕骨，与
足太阳之筋合（自阴器内行，由子宫上系肾间，并冲脉，循脊两旁，挟膂上至项，与足太阳之筋合，结于枕骨，
内属髓海）。是动则病饥不欲食，面黑如地色，
咳唾则有血，喝喝而喘，坐而欲起，目 如无听见，心如悬若饥状，气不足则善恐，心惕惕如人将捕之，
是谓骨厥。
是主肾所生病者，口热舌干，咽肿上气，嗌干及痛，烦心心痛，黄胆肠 ，脊臀股内后廉痛，痿厥嗜卧，足下
热而痛。盛者寸口大再倍于人迎，虚者寸口反小于人迎也。
(The kidneys are located on the left and right, one each, shaped like stone eggs, with a black-purple color. They are situated below and on both sides of the stomach, extending into the spinal muscles, attached to the fourteenth vertebra of the spine, aligned horizontally with the umbilicus anteriorly and posteriorly.)
The *Ling Shu* states: The Foot-Shaoyin Kidney Meridian originates from beneath the little toe, slanting towards the sole of the foot (the Yongquan acupoint), emerging below the Ran Gu acupoint, following behind the medial malleolus, and branching into the heel (Ran Gu is an acupoint name, located in the depression below the large bone at the front of the medial malleolus. Branching into the heel behind the medial malleolus refers to the locations of acupoints such as Taixi and Taizhong). It ascends along the posterior medial aspect of the lower leg, emerges at the anterior medial aspect of the lower leg (passing through Fuliu and Jiaoxin, crossing the Sanyinjiao acupoint of the Foot-Taiyin Spleen Meridian, ascending to Zubin on the medial aspect of the lower leg, and emerging at Yin Gu on the anterior medial aspect), ascends along the posterior medial aspect of the thigh, penetrates the spine, connects with the Kidney, and links with the Bladder (ascending to the posterior medial aspect of the thigh, it knots at the Changqiang acupoint of the Du Vessel, penetrating the spinal canal, then connecting with the Kidney; anteriorly corresponding to the regions of Guanyuan and Zhongji, it links with the Bladder. Mr. Hua [Shoushu] stated: From Yin Gu, it ascends along the posterior medial aspect of the thigh, penetrates the spine, meets at the Changqiang acupoint of the spine, returns to the front, follows Henggu, Dahe, Qixue, Siman, Zhongzhu, and Huangshu; at the location of Huangshu, on either side of the umbilicus, it connects with the Kidney, descends past the umbilicus, passes Guanyuan and Zhongji, and links with the Bladder); its straight branch ascends from the Kidney, penetrates the Liver and Diaphragm, enters the Lung, follows the throat, and flanks the root of the tongue (Mr. Hua stated: Ascending from the point where it connects with the Kidney at Huangshu, it follows Shangqu, Shiguan, Yindu, and Tonggu acupoints, penetrates the Liver, ascends along Youmen, crosses the Diaphragm, passes Bulang, enters the Lung, follows Shenfeng, Lingcang, Shencang, and Yufo acupoints, ascends along the throat, joins the Renying acupoint, and terminates flanking the root of the tongue); its branch emerges from the Lung, connects with the Heart, and pours into the Chest (this branch, from near the Shencang acupoint, emerges from the Lung to connect with the Heart, pouring into the Chest. Above the Yufo and other acupoints, the Foot-Shaoyin Meridian ends here and connects with the Hand-Jueyin Pericardium Meridian. The Chest is located between the two breasts, also known as Danzhong). Its collateral is named Dazhong, located behind the ankle, winding around the heel, and branching to the Taiyang Meridian; another branch travels along the main channel upwards to the Pericardium, and downwards and externally through the loins and spine. Pathological manifestations include: Qi rebellion causing irritability and oppression, Excess patterns causing urinary retention or difficulty, Deficiency patterns causing lower back pain; treatment should target the collateral (The collateral of the Foot-Shaoyin Meridian is named Dazhong, located between the two tendons above the bone at the back of the heel, branching to the Foot-Taiyang Bladder Meridian. The text mentions the main channel connecting with the Heart from the Lung, while this part describes ascending to the Pericardium and descending through the loins and spine, hence these symptoms. For treating these conditions, one should select the Dazhong acupoint of this collateral). Its regular pathway reaches the popliteal fossa, branches to the Taiyang Meridian to merge, ascends to the Kidney, at the level of the fourteenth vertebra, and exits to connect with the Dai Mai (Girdle Vessel); the straight branch ties to the root of the tongue, re-emerges at the nape, and merges with the Taiyang Meridian; this is called one combination, forming the regular pathways of the Yin meridians, which are constituted by the collaterals of the Yin meridians (This indicates that the Bladder and Kidney are exterior-interior pairs, so their meridians form a combination. The regular pathway of the Foot-Shaoyin Meridian merges with the Taiyang Meridian in the popliteal fossa, travels internally upwards to the Kidney, at the position beside the Shenshu acupoint at the fourteenth vertebra, and exits to connect with the Dai Mai; its straight branch ascends to tie to the root of the tongue, re-emerges at the nape, and merges with the Taiyang Meridian, constituting one of the Six Combinations. However, for every exterior there must be an interior; the regular pathways of the Yang meridians must be completed by the collaterals of the Yin meridians, not merely by lateral connections or intersections). Its sinews originate from beneath the little toe, running together with the sinews of the Foot-Taiyin Spleen Meridian, slanting towards below the medial malleolus, knotting at the calcaneus, merging with the sinews of the Foot-Taiyang Bladder Meridian, and ascending to knot below the medial condyle of the tibia (The sinews of the Foot-Shaoyin Meridian originate from beneath the little toe, slanting towards the sole; then slanting medially, ascending to Ran Gu, joining near the Shangqiu acupoint of the Foot-Taiyin Spleen Meridian, walking below the medial malleolus, knotting between the heel and calcaneus, merging with the sinews of the Taiyang Meridian, ascending from the medial side of the heel, and knotting near Yin Gu below the medial condyle). Running together with the sinews of the Taiyin Meridian, they ascend along the medial thigh, knotting at the genitalia (From below the medial condyle, running together with the sinews of the Taiyin Meridian, ascending along the medial thigh, meeting the sinews of the Taiyin, Jueyin, and Yangming Meridians at Henggu, and knotting at the genitalia; these are all strong sinews). Following the interior of the spine, flanking the paravertebral muscles, they ascend to the nape, knot at the occiput, and merge with the sinews of the Foot-Taiyang Bladder Meridian (From the genitalia, traveling internally, ascending via the uterus to connect with the area between the Kidneys, joining the Chong Mai, following both sides of the spine, flanking the paravertebral muscles, ascending to the nape, merging with the sinews of the Foot-Taiyang Bladder Meridian, knotting at the occiput, and internally connecting to the Sea of Marrow). When the meridian undergoes pathological changes, diseases manifest as: feeling hungry but having no desire to eat, complexion dark as earth, coughing and spitting blood, panting with audible breathing sounds, wanting to rise when sitting, eyes appearing dim as if unable to see, ears ringing as if unable to hear, the heart feeling empty and suspended like hunger, Qi deficiency leading to frequent fear, mental restlessness as if someone were about to capture them; this is termed Bone Jue (Kidney Meridian Reversal).
This meridian governs diseases generated by the Kidney: heat in the mouth and dryness of the tongue, swelling and obstruction in the throat, rebellious Qi, dryness and pain in the pharynx, vexation and heart pain, jaundice, intestinal dysentery, pain in the spine, buttocks, and posterior medial aspect of the thigh, Wei syndrome with cold extremities and drowsiness, heat and pain in the soles of the feet. In terms of pulse diagnosis, when the pathogenic factor is excessive, the Cun Kou pulse is twice as large as the Ren Ying pulse; when the healthy Qi is deficient, the Cun Kou pulse is smaller than the Ren Ying pulse.