Locating Specific Acupoints Large Intestine 4 (LI4) and Large Intestine 6 (LI6) in Cadavers Using Anthropometric and Cun Measurement Systems
JAMS Journal of Acupuncture and Meridian Studies
Background: Anthropometric and anatomical Chinese inch measurement (CUN) systems are useful in understanding the location of acupoints; however, locating acupoints is challenging. Objectives: The study aimed to locate LI4 and LI6, to measure differences and similarities in body dimensions based on sex using anthropometric and CUN systems, and to observe the relationship between f-cun and b-cun. Methods: 25 forearms and hands from 16 embalmed cadavers had body dimensions measured using anthropometric and CUN systems. LI4 and LI6 were located using a combination of both systems. Data were compiled and calculated to observe any variation in means and ranges. Statistical analysis was performed using a paired t-test. Results: LI4 was found on the skin at the lateral border of the midpoint of the second metacarpal bone. LI6 was found 3 cun or 74 ± 8 mm from LI5. Differences were observed between male and female cadavers and a large difference between f-cun and b-cun measurements of 1.5 to 3 cun. There were positive correlations between several body dimensions observed. Conclusions: LI4 was located on the dorsum of the hand, radial to the midpoint of the second metacarpal bone. LI6 was located 3 cun from LI5 with an error of 1 to ½ cun variation. The differences in f-cun and b-cun in isolating LI6 seem to account for this error. Future studies using cadavers may need to take this error into consideration for variation and measuring differences.
Casey, Gregory P., "Locating Specific Acupoints Large Intestine 4 (LI4) and Large Intestine 6 (LI6) in Cadavers Using Anthropometric and Cun Measurement Systems" (2020). School of Medicine Faculty Publications. 1529.