臣瑾曰∶夫针灸之术，其旨微矣。穴法之讹，其来远矣。如背俞、膏肓数穴，皆起死回
要穴，而折量分寸皆致讹谬。臣获善同陈先生亲授，一穴一法毫厘有据。且如背俞，前贤书
中皆云夹脊各寸半是，共折三寸，分二旁取之。
殊不知言夹脊，其夹字是除骨而言。若带脊骨，当以两旁各二寸，共折四寸分两旁。又
如膏
旁，按其酸疼处乃是真穴。臣每根据此灸疗，多获痊愈。又折量之法，世俗盗学，妄传自头部
、背部、手足背，一概用“同身寸”量之，殊不知头部有头部之尺寸，腹部有腹部之尺寸，
横直尺寸俱不同，各有其要，惟背部、手足部并用同身寸取之。学人于兹，不可不注意焉，
故书此以正之。
前发际至后发际折作十二节，为一尺二寸。前发际不明者，取眉心上行三寸；后发际不
明者，取大椎上行三寸；前后发际不明者，共折作一尺八寸。
横寸以眼内 角比至外 角，为一寸。头部横寸并用此法。
神庭至曲差、曲差至本神、本神至头维，各一寸半。自神庭至头维共四寸半。
大椎穴下至尾 ，共二十一椎，通折作三尺。
上七椎，每椎一寸四分一厘，共九寸八分七厘。
中七椎，每椎一寸六分一厘。
十四椎与脐平，共二尺一寸一分四厘。
下七椎，每椎一寸二分六厘。
第二行夹脊，各寸半，除脊一寸，共折作四寸，分两旁。第三行夹脊各三寸，除脊一寸
，共折作七寸，分二旁。
Minister Liu Jin stated: The art of acupuncture and moxibustion is profound in its principles. Errors in acupoint location methods have existed for a long time. For instance, the Back-Shu points (Back-Shu points, acupoints on the bladder meridian corresponding to internal organs) and Gaohuang (BL-43, Gallbladder Meridian) are vital points capable of reviving the dying, yet their proportional measurements have all been subject to errors. I received correct instruction directly from Mr. Chen; every point and method is based on precise measurements.
Regarding the Back-Shu points, ancient texts state that they are located 1.5 cun lateral to the spine, totaling 3 cun, divided between both sides. However, it is unknown that the character "jia" (clamp/adjacent) in "jia ji" refers to excluding the vertebral column itself. If including the vertebral column, the measurement should be 2 cun lateral to each side of the spine, totaling 4 cun, divided between both sides.
Similarly, regarding Gaohuang (BL-43), laypeople often search only according to book locations, whereas the true acupoint is found where pressing elicits soreness and pain. Whenever I treat using this method, recovery is frequently achieved.
Furthermore, regarding proportional measurement methods, common people steal and falsely transmit knowledge, applying "body-inch" (tong shen cun, a proportional measurement unit based on the patient's own body dimensions) uniformly from the head, back, to the dorsum of hands and feet. It is unknown that the head has its own dimensions, and the abdomen has its own dimensions; horizontal and vertical measurements differ, each having its specific key points. Only the back and the extremities (hands and feet) uniformly use body-inches for locating points. Learners must pay close attention to this, hence these writings are recorded to correct errors.
From the anterior hairline to the posterior hairline is measured as twelve segments, equivalent to one chi and two cun. If the anterior hairline is unclear, measure three cun upward from the midpoint of the eyebrows; if the posterior hairline is unclear, measure three cun upward from Dazhui (GV-14, Governing Vessel); if both anterior and posterior hairlines are unclear, measure a total of one chi and eight cun.
One cun horizontally is defined by the distance from the inner canthus to the outer canthus of the eye. This method is used for all horizontal measurements on the head.
From Shenting (GV-24, Governing Vessel) to Qucha (EX-HN4, Extra Point), from Qucha to Benshen (GB-13, Gallbladder Meridian), and from Benshen to Touwei (ST-8, Stomach Meridian), each measures 1.5 cun. From Shenting to Touwei, the total is 4.5 cun.
From Dazhui (GV-14) down to the coccyx, there are twenty-one vertebrae in total, measured as three chi.
The upper seven vertebrae: each measures 1.41 cun, totaling 9.87 cun.
The middle seven vertebrae: each measures 1.61 cun.
The fourteenth vertebra is level with the umbilicus, totaling 2.114 chi.
The lower seven vertebrae: each measures 1.26 cun.
The second row of Jiaji points (EX-B2, Extra Points adjacent to the spine): 1.5 cun lateral to the spine, excluding 1 cun for the spine itself, totaling 4 cun, divided between both sides. The third row of Jiaji points: 3 cun lateral to the spine, excluding 1 cun for the spine itself, totaling 7 cun, divided between both sides.