（俗呼为尾骨，长强穴分也，一名橛骨，亦谓之穷骨）属足太阳膀胱经、督脉之会（《灵
枢》曰∶督脉之别，名曰长强，挟膂上项，散头上。又曰∶内闭不得溲，刺足少阴、太阳，与 上以长针）。
又属足少阴肾经。（《明堂经》曰∶长强一穴，在脊 端穷骨下宛宛中，乃督脉别络，足少阴所结也。沈承
之曰∶脊 端，属足少阴肾、少阳胆经之结会也）。
（即臀也，尻骨曰八 骨。尻骨两旁，各有四骨空，名上 、次 、中 、下 ，左右
各八穴，故曰八 骨也）属足太阳膀胱经、督脉、冲脉之会（《灵枢》曰∶营气合足太阳，循脊下尻。又曰∶
足太阳之脉，其支者从 中下挟脊，贯臀，入 中。所生病者，腰、尻、 、 、脚皆痛。《素问》曰∶督脉
之络别绕臀，至少阴与巨阳中络者合。又曰∶太阳所谓肿腰 痛者，注∶ ，臀肉也。沈承之曰∶人身有一谷
八溪。肉之大会为谷，一谷者，臀也。肉之小会为溪，八溪者，二肘二膝四腕也。溪谷之间，以行营卫，以会
大气、故督脉之络，别绕臀，冲脉为血海，主灌渗溪谷。顾英白曰∶经言肉之大会，皆指诸经络耳，经有十二，
故大谷亦十二，孙络三百六十五，除十二经之 穴，故小溪三百五十三，非止一谷八溪也。况经无一谷之文，不知
承之何据而云此）。兼属足太阴脾经（《素问》曰∶邪客于足太阴之络，令人腰痛，引少腹控 ，不可以仰息，
刺腰尻之解，注∶足太阴之络，从髀合阳明，上贯尻骨中，与厥阴、少阳，结于下 ，而循尻骨内入腹，故腰
痛则引少腹，控于 中也，腰尻骨间曰解是也）。又属足少阴肾经、少阳胆经（《灵枢》曰∶肾下则腰尻痛，
不可以俯仰，为狐疝。肾偏倾，则苦腰尻痛也。又曰∶足少阳之筋，前者结于伏兔，后者结于尻。其病 筋急，
引髀后，转引尻）。
（俗称为尾骨，是长强穴所在之处，又名橛骨，也称之为穷骨）此处为足太阳膀胱经与督脉的交会点（《灵枢》记载：督脉的别络，名为长强，挟持脊柱上行至项部，散布于头部。又说：若内部闭塞导致小便不通，应针刺足少阴、足太阳经，并使用长针在上部穴位施治）。
又归属于足少阴肾经。（《明堂经》记载：长强这一穴位，位于脊柱末端穷骨下方的凹陷处，乃是督脉的别络，也是足少阴经气血结聚之处。沈承之说：脊柱末端，属于足少阴肾经和足少阳胆经的气血结会之处）。
（即臀部，尻骨被称为八髎骨。在尻骨两旁，各有四个骨孔，名称分别为上髎、次髎、中髎、下髎，左右各八个穴位，所以称为八髎骨）此处为足太阳膀胱经、督脉、冲脉的交会点（《灵枢》记载：营气合于足太阳经，沿脊柱下行至尻部。又说：足太阳经脉的分支，从腰中部向下挟持脊柱，贯穿臀部，进入腘窝中。该经所生的病症包括：腰部、尻部、腘窝、小腿及脚部均疼痛。《素问》记载：督脉的别络环绕臀部，至少阴经与巨阳经的中络处相合。又说：太阳经所说的腰部肿胀疼痛，注解说：髀，指臀部的肌肉。沈承之说：人体有一谷八溪的说法。肌肉的大聚会处称为谷，一谷即指臀部。肌肉的小聚会处称为溪，八溪即指两肘、两膝、四腕。溪谷之间，运行营卫之气，汇聚大气，因此督脉的别络，别行环绕臀部；冲脉为血海，主要灌注渗润溪谷。顾英白说：经文所说的肌肉大聚会，都指的是诸经络而言，经脉有十二条，所以大谷也有十二个；孙络有三百六十五条，除去十二经的本穴，所以小溪有三百五十三个，并不止于一谷八溪。况且经文中没有关于“一谷”的文字，不知道沈承之依据什么而这样说）。兼属足太阴脾经（《素问》记载：邪气侵犯足太阴经的络脉，使人腰痛，牵引少腹并控引髀部，不能仰卧呼吸，应针刺腰尻之间的缝隙，注解说：足太阴经的络脉，从大腿内侧合于阳明经，向上贯穿尻骨中间，与厥阴经、少阳经在下髎处结聚，并沿尻骨内侧进入腹部，所以腰痛会牵引少腹，控引于髀部中间，腰尻骨间的缝隙称为解，就是这里）。又归属于足少阴肾经、足少阳胆经（《灵枢》记载：肾脏下垂则腰痛且尻痛，不能俯仰，称为狐疝。肾脏偏倾，则苦于腰尻疼痛。又说：足少阳经的筋，前部结聚于伏兔穴，后部结聚于尻部。其病症表现为筋脉拘急，牵引大腿后侧，进而牵引至尻部）。
(Colloquially referred to as the coccyx, it is the location of the Changqiang (Long Strong) acupoint, also known as Juegu (Stub Bone), and further called Qionggu (Exhausted Bone).) This area is the intersection of the Foot-Taiyang Bladder Meridian and the Du Mai (Governing Vessel). (*Ling Shu* states: The collateral branch of the Du Mai is named Changqiang; it runs alongside the spine to the nape, scattering over the head. It also states: In cases of internal obstruction leading to urinary retention, needle the Foot-Shaoyin and Foot-Taiyang meridians, using a long needle on upper points.)
It also belongs to the Foot-Shaoyin Kidney Meridian. (*Mingtang Jing* states: The Changqiang acupoint is located in the depression below the end of the sacrum/coccyx at the tip of the spine; it is the collateral branch of the Du Mai and the site where the Qi of the Foot-Shaoyin condenses. Shen Chengzhi says: The tip of the spine is the convergence point of the Foot-Shaoyin Kidney Meridian and the Foot-Shaoyang Gallbladder Meridian.)
(This refers to the buttocks; the sacral bone is called the Ba Liao (Eight Holes) bone. On both sides of the sacral bone, there are four bony foramina each, named Shangliao (Upper Hole), Ciliao (Secondary Hole), Zhongliao (Middle Hole), and Xialiao (Lower Hole); with eight acupoints on each side, left and right, hence the name Ba Liao bone.) This area is the intersection of the Foot-Taiyang Bladder Meridian, the Du Mai (Governing Vessel), and the Chong Mai (Penetrating Vessel). (*Ling Shu* states: Ying Qi combines with the Foot-Taiyang meridian and follows the spine down to the sacrum. It also states: A branch of the Foot-Taiyang meridian descends from the middle of the waist, flanking the spine, passing through the buttocks, and entering the popliteal fossa. Diseases generated by this meridian include pain in the lower back, sacrum, popliteal fossa, calf, and foot. *Su Wen* states: The collateral of the Du Mai winds around the buttocks and joins with the Middle Collateral of the Foot-Shaoyin and the Great Yang [Foot-Taiyang]. It also states: Regarding the swelling and pain in the lower back mentioned by the Taiyang channel, the commentary notes: Bi refers to the flesh of the buttocks. Shen Chengzhi says: The human body has the concept of one valley and eight streams. The large gathering of muscle is called a valley; the one valley refers to the buttocks. The small gathering of muscle is called a stream; the eight streams refer to the two elbows, two knees, and four wrists. Between the streams and valleys, Ying and Wei Qi circulate, and Da Qi gathers. Therefore, the collateral of the Du Mai winds around the buttocks; the Chong Mai is the Sea of Blood, primarily responsible for irrigating and moistening the streams and valleys. Gu Yingbai says: The text's mention of "large gatherings of muscle" refers generally to the meridians. Since there are twelve primary meridians, there are also twelve large valleys. There are 365 Sun Luo (Sun Collaterals); excluding the main acupoints of the twelve meridians, there are 353 small streams, not just one valley and eight streams. Moreover, the classics do not contain the term "one valley," so it is unclear on what basis Shen Chengzhi makes this claim.) It also pertains to the Foot-Taiyin Spleen Meridian. (*Su Wen* states: When pathogenic factors invade the collateral of the Foot-Taiyin meridian, it causes lower back pain that radiates to the lower abdomen and controls the thigh region, making supine breathing difficult. One should needle the gap between the waist and sacrum. Commentary notes: The collateral of the Foot-Taiyin meridian merges with the Yangming meridian from the thigh, passes upward through the center of the sacral bone, and knots with the Jueyin and Shaoyang meridians at the lower liao points, then enters the abdomen along the inner aspect of the sacral bone. Thus, lower back pain radiates to the lower abdomen and controls the middle of the thigh; the gap between the lumbar and sacral bones is called the "Jie" (gap/solution).) It also belongs to the Foot-Shaoyin Kidney Meridian and the Foot-Shaoyang Gallbladder Meridian. (*Ling Shu* states: If the kidney descends, it causes lower back and sacral pain, making flexion and extension impossible, termed Hu Shan (Fox Hernia). If the kidney is tilted, it causes severe lower back and sacral pain. It also states: The sinews of the Foot-Shaoyang meridian knot anteriorly at the Futu acupoint and posteriorly at the sacrum. Its pathology involves tendon tightness, pulling the posterior thigh and subsequently drawing into the sacrum.)