肾主骨，在体为骨，在藏为肾。又云∶肾之合骨也，其荣发也。又云∶少阴者，冬脉也，伏行而濡
骨髓者也。
一身骨度之长短，见阴阳表里条。
〔《素》〕髓空在脑后三分，在颅际锐骨之下。（王注云∶是谓风府，通脑中也。）
一在断基下。（王注云∶当颐下骨陷中容豆许。）一在项后中复骨下。（王注云∶喑门穴也。）一在脊骨
上空，在风府上。（王注云∶上谓脑户穴也。）脊骨下空，在尻骨下空。（林亿云∶长强在脊 端，正
在尻骨下。）数髓空在面侠鼻，（王注云∶颧 等穴也。）或骨空在口下，当两肩。（王注云∶大迎穴也。）
两膊骨空，在膊中之阳。（王注云∶近肩 穴。）臂骨空在臂阳，去踝四寸，两骨空之间。（王注云∶在
支沟上，同身寸之一寸，是谓通间。）股骨上空在股阳，出上膝四寸。（王注云∶在阴市上伏兔穴下，
在承捷也。） 骨室，在辅骨之上端。（王注谓犊鼻穴也。）股际骨空，在毛中动下。尻骨空，在髀骨之后，
相去四寸。（王注云∶八 穴也。）扁骨有渗理凑，无髓孔，易髓无空。（俱骨空篇 王注云∶扁骨谓尻
间扁戾骨也，其骨上有渗灌文理归腠，无别髓孔也。）
骨病忌食甘苦久立。经云∶多食甘则骨痛而发落。又云∶苦走骨，骨病无多食苦。又云∶久立伤骨是也。
骨病不屈。经云∶手屈而不伸者，病在筋，伸而不屈者，病在骨，在骨守骨，在筋守筋也。
肾主管骨骼，在形体上表现为骨，在脏腑中归属于肾。又说：肾与骨相合，其华彩表现在头发。又说：少阴经是冬季的脉象，潜行体内以濡养骨髓。
〔《黄帝内经·素问》〕髓空位于脑后三分处，在颅侧锐骨之下。（王冰注解说：这叫做风府穴，通达脑部。）
另一个髓空在下颌骨下方。（王冰注解说：正当下巴下方的骨陷中，可容纳一颗豆子大小的空间。）另一个在项部正中复骨之下。（王冰注解说：这是喑门穴。）另一个在脊骨上方，风府穴之上。（王冰注解说：上方指的是脑户穴。）脊骨下方的空隙，在尾椎骨下方的空隙。（林亿注解说：长强穴在脊柱末端，正位于尾椎骨下方。）面部两侧靠近鼻子的数个髓空，（王冰注解说：包括颧髎等穴位。）或者口下的骨空，正当两颊骨处。（王冰注解说：这是大迎穴。）
两臂膊部的骨空，位于臂部外侧阳面。（王冰注解说：靠近肩髃穴。）臂部的骨空在臂部阳面，距离踝关节四寸，两根骨头之间的空隙。（王冰注解说：在支沟穴上方，同身寸一寸处，称为通间穴。）大腿骨上方的骨空在大腿阳面，位于膝盖上方四寸处。（王冰注解说：在阴市穴上方、伏兔穴下方，即承扶穴。）膝眼骨室，位于辅骨的上端。（王冰注解说指犊鼻穴。）大腿根部骨空，在阴毛中搏动处的下方。尾椎骨空，在大腿骨之后，相距四寸。（王冰注解说：即八髎穴。）扁骨有渗灌纹理汇聚，没有髓孔，容易变化骨髓而没有固定的骨空。（以上均出自《骨空论》篇，王冰注解说：扁骨指的是尾闾间的扁平弯曲之骨，其骨上有渗灌文理归于腠理，没有其他的髓孔。）
患骨病时忌食甘甜食物及久站。经文说：多吃甘味食物会导致骨痛和脱发。又说：苦味入走骨，患骨病时不要多吃苦味食物。又说：久站会损伤骨骼，就是这个道理。
The Kidney governs the bones, manifests as bones in the physical body, and is stored within the Kidneys. It is also stated: The Kidney corresponds to the bones, and its luster appears in the hair. Furthermore: Shaoyin (Lesser Yin) is the pulse of winter, which runs deep within to moisten the bone marrow.
The lengths and dimensions of the bones throughout the body are detailed in the section on Yin-Yang and Exterior-Interior.
[From *Suwen*] The Marrow Cavity (Sui Kong) is located three fen behind the head, beneath the sharp bone at the side of the skull. (Wang Bing's commentary states: This is referred to as Fengfu [Wind Palace], connecting to the brain.)
Another is located below the mandible base. (Wang Bing's commentary states: It is in the bony depression below the chin, capable of holding a space the size of a bean.) Another is below the posterior midline vertebrae of the neck. (Wang Bing's commentary states: This is the Yanmen [Dark Gate] acupoint.) Another is above the spinal column, superior to Fengfu. (Wang Bing's commentary states: "Superior" refers to the Naohu [Brain Door] acupoint.) There is a cavity below the spinal column, specifically the cavity below the sacrum. (Lin Yi's commentary states: Changqiang [Long Strength] is at the end of the spine, directly below the sacrum.) Several Marrow Cavities are located on the face flanking the nose. (Wang Bing's commentary states: These include Zanguan [Cheekbone Hollow] and other points.) Or there is a bone cavity below the mouth, corresponding to the two cheeks. (Wang Bing's commentary states: This is Daying [Great Meeting].)
The bone cavities of both arms are located on the lateral aspect of the upper arm. (Wang Bing's commentary states: Near Jianyu [Shoulder Well].) The bone cavity of the forearm is on the lateral aspect of the arm, four cun distal to the ankle, between the two bones. (Wang Bing's commentary states: Above Zhigou [Branch Stream], one cun using the same-body inch method, called Tongjian [Passing Between].) The bone cavity above the femur is on the anterior-lateral aspect of the thigh, four cun superior to the knee. (Wang Bing's commentary states: Superior to Yinshi [Yin Market], inferior to Futu [Riding Rabbit], i.e., Chengfu [Receiving Support].) The Gu Shi [Bone Chamber] is at the upper end of the auxiliary bone. (Wang Bing states this refers to Dubi [Goat Cleft].) The bone cavity at the root of the thigh is below the pulsating area in the pubic region. The sacral bone cavity is posterior to the hip bone, four cun apart. (Wang Bing's commentary states: These are the Baliao [Eight Holes] points.) Flat bones have permeating textures converging, without marrow pores; they facilitate the transformation of marrow but lack fixed bone cavities. (All from the *Gu Kong* [Bone Cavities] chapter. Wang Bing's commentary states: Flat bones refer to the flat, curved bones of the coccyx region; their surfaces have permeating textures returning to the couli [interstices], with no distinct marrow pores.)
Patients with bone diseases should avoid sweet foods and prolonged standing. The classics state: Excessive consumption of sweet flavors causes bone pain and hair loss. It is also said: Bitter flavor travels to the bones; those with bone diseases should not consume excessive bitter flavors. It is further stated: Prolonged standing injures the bones.
Bone diseases manifest as limited flexion and extension. The classics state: If the hand can flex but not extend, the disease is in the sinews; if it can extend but not flex, the disease is in the bones. When the pathology is in the bones, treat the bones; when in the sinews, treat the sinews.