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Using the left hand of males or the right hand of females, bend the thumb and middle finger so that their tips meet to form a ring. The distance between the two ends of the transverse crease at the middle phalanx of the middle finger is taken as one Cun (body-inch). For any longitudinal measurements of the arms (note: originally written as "legs" in some editions, which is an error) and horizontal measurements of the back and abdomen, where no other folding methods apply, this method shall be used as the basis.

[Image Placeholder: Diagram of Middle Finger Body-Inch Method]

*(Lei Jing Tu Yi)*
The term "Tong Shen Cun" (Body-Inch) refers to a measurement standard proportional to the patient's own body dimensions. Since individuals vary in height, build, and leanness, the horizontal and vertical distances for acupoints cannot be uniformly fixed. The current method is adopted to ensure appropriateness. As stated in *Biao You Fu* (Subtle Profound Ode): "When selecting five acupoints, one must establish a reference; when selecting three meridians, one must rectify one meridian." This implies correcting a specific meridian by referencing adjacent meridians, and correcting a specific acupoint by referencing adjacent acupoints. Just as in character composition, using one phonetic component above and one rhyme component below, sandwiching the sound in the middle, the nature of the meridians and acupoints will naturally be revealed without concealment. Therefore, the head must be measured with head proportions, the abdomen with abdominal proportions, the back with back proportions, and the hands and feet with hand and foot proportions. By synthesizing their lengths and sizes to find the mean proportion, it can truly be called the Tong Shen Cun method.

Dian (Vertex/Top of head) Nao (Brain/Marrow Sea within the skull) Xin (Xin fontanelle, located on the cranial bone; in infants, the soft, pulsating area where the cranial bones have not yet fused, known as the anterior fontanelle) E Liu (Forehead and frontal skull; the hairline anterior to the Xin is the forehead/frontal region) Yan (Upper forehead; according to *Shuo Wen Jie Zi*, the area between the eyebrows and eyes) Bi Liang (Nasal bridge, also named Xia Ji or Shan Gen) Mu Xia (Area beneath the eyes) Nei (Temporal region; pronounced 'rou she qie', similar to the pulsating area in front of the ear, commonly known as the temple) Han (Cheek/jaw area below the cheekbones) Mu Xi (Optic nerve/deep structures within the eye) Nei Ying (Inner canthus/corner of the eye) Rui Ying (Outer canthus/corner of the eye) Ren Zhong (Philtrum; above the lip, below the nose) Chi Ya (Teeth; small anterior teeth are Chi, large posterior teeth are Ya) She Ben (Base of the tongue) Yan (Pharynx/Oropharynx; used for swallowing food and drink, located behind the throat) Hou (Larynx/Trachea; used for breathing, located anterior to the pharynx) Ai (Throat/Pharynx, pronounced 'yi') Hui Yan (Epiglottis; located in the larynx, acting as the gate for voice production) Fei Xi (Lung system; referring to the trachea/throat) Hang Sang (Posterior nasal cavity/Sphenoid sinus area; 'Hang' pronounced 'hang', the upper posterior part of the pharynx) Jing Xiang (Neck and nape; sides of the neck stem are Jing, posterior is Xiang, also referred to as the back of the head) Tian Zhu Gu (Tian Zhu Bone; upper margin of the scapula/root of the cervical spine) Jian Jie (Shoulder joint/space; the two angles above the spinal muscles) Jian Jia (Scapula; 'Jia' pronounced 'jia', the flat bone below the shoulder joint, also named Jian Bo) Ju Gu (Giant Bone; clavicle/transverse bone above the chest) Ying (Chest/Pectoral region; 'Ying' pronounced 'ying', the front of the chest, or the high areas on both sides of the chest) Xiong Zhong (Center of the chest; between the two nipples) Ge (Diaphragm; above the diaphragm is the gathering point of Zong Qi, known as Dan Zhong) Ye (Axilla/Armpit; upper boundary of the hypochondrium) Ji Xie (Hypochondriac ribs; short, small ribs at the lower end of the costal margin) Qu (Area below the axilla and above the hypochondrium, pronounced 'qu') Jiu Wei (Tailbone/Costal cartilage covering the heart; also known as Jian Gu, pronounced 'ji gan') Ji Xia (Lower end of the xiphoid process; pronounced 'miao', the empty and soft area on both sides below the hypochondriac ribs) Ji Gu (Spinal column; 'Ji' refers to vertebrae) Shen (Paraspinal muscles; 'Shen' pronounced 'shen', muscles inside the spine,夹脊肉) Lv (Spinal muscles; 'Lv' is synonymous with spine, pictographic, also refers to muscles on both sides of the spine) Gu Duan (Bone end; 'Yu' pronounced 'yu', the end of the bone at the shoulder) Yao Gu (Lumbar bone; transverse bone above the sacrum) Yao Ke (Lumbar condyle; 'Ke' pronounced 'ku wa', i.e., lumbar bone, attachment site of paraspinal muscles from the 16th vertebra downward) Fu (Abdomen; area above and below the umbilicus; below the umbilicus is Shao Fu) Mao Ji (Hairline of the pubic region; on both sides of Qugu, where the arterial pulse of Zuyangming Stomach Meridian Qichong point is felt) Lu (Skin; 'Lu' pronounced 'lu', also refers to the anterior abdomen) Gao (Testicles; 'Gao' pronounced 'gao', scrotal testis) Cuan (Perineum area; 'Cuan' pronounced 'chu guan', between the tendons of Ping Yi, deep inside is Xia Ji) Xia Ji (Lower Pole; between the two yin organs, at Ping Yi, i.e., Huiyin point) Tun (Buttocks; 'Tun' pronounced 'tun', meat behind the hip, large flesh beside the sacrum) Ji (Hip joint area; beside the waist and hip bones) Kuan (Hip; 'Kuan' pronounced 'kuan', sacrum and buttocks, or space between thighs) Kao (Sacrum/Coccyx; 'Kao' pronounced 'kai gao', tailbone, also named Qiong Gu) Gang (Anus; 'Gang' pronounced 'gong', common pronunciation 'gang', gate of the large intestine) Rou (Fleshy prominence; 'Nao' pronounced 'nao', raised white flesh on the inner side below the shoulder blade opposite the axilla) Zhou (Elbow; middle segment of the arm) Bi (Arm; area above and below the elbow, or specifically below Quchi) Wan (Wrist; junction of arm and palm) Dui Gu (Lateral malleolus of the wrist/hand) Cun Kou (Radial artery; arterial pulses at the front and back of both hands are all called Cun Kou) Que (Gu Point; high swelling at the arterial pulse behind the palm is called Guan) Yu Ji (Thenar eminence; fleshy protrusion before the wrist resembling a fish. Anterior to Cun, posterior to Yu, is the Yu Ji acupoint) Da Zhi Ci Zhi (Index finger; the finger next to the thumb, i.e., index finger. Same for feet) Xiao Zhi Ci Zhi (Ring finger; the finger next to the little finger, i.e., ring finger. Same for feet) Bi (Thigh; 'Bi' pronounced 'bi', thigh bone/femur) Bi Guan (Bi Guan point; intersection wrinkle above Futu) Bi Yan (Hip depression; below Jie Gu, i.e., center of Bi Shu) Bi Shu (Hip pivot; below Jie Gu and above Bi, corresponds to Huantiao point) Gu (Thigh/Femur) Futu (Futu point; muscular prominence anterior to the thigh, below the knee) Bin (Patella/Kneecap; 'Bin' pronounced 'pin') Gu Hou (Popliteal fossa; 'Guo' pronounced 'guo', curved area behind the knee) Fu Gu (Accessory bone; large bones on the medial and lateral sides below the knee) Cheng Gu (Cheng Gu bone; bone standing out alone at the lateral edge of the knee) Fei Chang (Calf muscle; 'Zhuan' pronounced 'zhuan', also named Fei Chang, lower calf belly) Fei Chang (Calf; 'Fei' pronounced 'fei', calf muscle) Ting Gu (Tibia; 'Hang' pronounced 'hang', tibial bone) Gong Gu (Fibula; 'Gan' pronounced 'gan', fibular bone) Jing (Tibia/Shank bone; 'Xing' pronounced 'xing', stem bone of the foot) Jue Gu (Jue Gu bone; pointed bone above the lateral malleolus) Jiang Xu (Muscle knot; 'Jiong' pronounced 'jiong', place where muscles and sinews gather. Direct pronunciation says fat in intestines. Wang Shi says fleshy masses behind elbows and knees) Ke Gu (Malleolus bone; 'Ke' pronounced 'ke', round bones on both sides behind the dorsum of the foot. Medially is Nei Huai (medial malleolus), laterally is Wai Ke (lateral malleolus). Also written as An Gu, commonly called Gu Guai Gu. Round bones on both sides of the wrist are also named Ke Gu) Fu (Dorsum of the foot; 'Fu' and 'Pu' pronunciations) Nei Jin (Large tendon above medial malleolus, located posterior to Taiyin meridian, about 2 Cun above the ankle) Zu Qi Gu (Qi Gu of foot; bone after the base of the big toe) Gen Gu (Calcaneus/Heel bone; 'Gen' pronounced 'gen', heel of the foot) He Gu (Heel bone; also written as He Gu, round bone on the medial side after the base of the big toe) Zhong (Heel; same as Gen) Ruan (Heel; 'Ruan' pronounced 'ruan', same as Zhong, interchangeable) San Mao (Three Hairs; hairs behind the nail of the big toe. Transverse crease behind the hairs is Ju Mao).