条文：
膂骨以下至尾□，二十一节，长三尺。
（膂骨，脊骨也。脊骨外小而内巨，人之所以能负任者，以是骨之巨也。
脊骨二十四节，今云二十一节者，除项骨三节不在内。
尾□骨男子者尖，女人者平。）
腰围四尺二寸。
按：
背部折法：自大椎至尾□，通折三尺。
上七节各长一寸四分一厘，共九寸八分七厘。
中七节各一寸六分一厘，共一尺一寸二分七厘。
第十四节与脐平，下七节各一寸二分六厘，共八寸八分二厘，
共二尺九寸九分六厘。不足四厘者，有零未尽也。直寸根据此，
横寸用中指同身寸法。脊骨内阔一寸。
凡云第二行侠脊一寸半，三行侠脊三寸者，皆除脊一寸外，净以寸半三寸论，
故在二行当为二寸，在三行当为三寸半也。
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条文：
自拄骨下行腋中不见者，长四寸。（拄骨颈项根骨也。）
腋以下至季胁，长一尺二寸。（季胁小肋也。）
季胁以下至髀枢，长六寸。（大腿曰股，股上曰髀，
楗骨之下，大腿之上，两骨合缝之所曰髀枢，当足少阳环跳穴处也。）
髀枢下至膝中，长一尺九寸。
横骨上廉下至内辅之上廉，长一尺八寸。
（骨际曰廉，膝旁之骨突出者曰辅骨，内曰内辅，外曰外辅。）
内辅之上廉以下至下廉，长三寸半。（上廉、下廉，可摸而得。）
内辅下廉下至内踝，长一尺二寸。
内踝以下至地，长三寸。
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Article:
From the Lv bone (spinous process of lumbar vertebrae) down to the coccyx, there are twenty-one segments, with a total length of three chi.
(The Lv bone refers to the vertebral column. The vertebral column is small externally but massive internally; the reason humans can bear weight is due to the massiveness of these bones.
There are twenty-four segments in the vertebral column. The mention of twenty-one segments here excludes the three segments of the cervical spine from the calculation.
In males, the coccyx is pointed; in females, it is flat.)
The circumference of the waist is four chi two cun.
Note on Measurement:
Measurement of the back: From the Dazhui point (GV14) to the coccyx, the total measurement is three chi.
The upper seven segments each measure one cun four fen one li, totaling nine cun eight fen seven li.
The middle seven segments each measure one cun six fen one li, totaling one chi one cun two fen seven li.
The fourteenth segment is level with the umbilicus. The lower seven segments each measure one cun two fen six li, totaling eight cun eight fen two li.
The sum is two chi nine cun nine fen six li. The remaining four li are unaccounted fractional parts. Vertical measurements are based on this standard,
while horizontal measurements use the middle finger's equal-body cun method. The internal width of the vertebral column is one cun.
Whenever it is stated that the second row is one and a half cun from the spine, or the third row is three cun from the spine, the one-cun width of the spine itself is excluded, and calculations are made purely based on one and a half cun and three cun respectively.
Therefore, in the second row, the actual distance should be two cun, and in the third row, it should be three and a half cun.
Article:
From the Zhugu point (Jianjing, GB21) down to the invisible part within the axilla, the length is four cun. (Zhugu refers to the bone at the root of the neck.)
From below the axilla to the hypochondrium (Ji Xie), the length is one chi two cun. (The Ji Xie refers to the floating ribs.)
From below the hypochondrium to the Bitshu (hip joint), the length is six cun. (The thigh is called Gu; the upper part of the thigh is called Bi. Below the Jian bone and above the thigh, the junction where the two bones meet is called Bitshu, located at the Huantiao point (GB30) of the Foot-Shaoyang Gallbladder Meridian.)
From the Bitshu down to the center of the knee, the length is one chi nine cun.
From the upper border of the Henggu (pubic bone) to the upper border of the medial epicondyle, the length is one chi eight cun.
(The edge of a bone is called Lian. The protruding bone beside the knee is called Fugu. The inner side is called Neifu, and the outer side is called Waifu.)
From the upper border of the medial epicondyle down to its lower border, the length is three and a half cun. (The upper and lower borders can be palpated.)
From the lower border of the medial epicondyle to the medial malleolus, the length is one chi two cun.
From the medial malleolus down to the ground, the length is three cun.