종설 : 기경팔맥 중 독맥, 임맥, 충맥, 대맥에 극혈이 없는 이유에 대한 연구

Objectives: Accumulation point is a useful acupoint for acute pain diseases. Among the eight extra meridians, only four (Yin Heel, Yang Heel, Yin Link, Yang Link vessel) have accumulation point and the others (Governor, Conception, Thoroughfare, Belt Vessel) do not. However, there is no explanation why these four meridians do not have it. So, the authors researched the literature to look for the reasons. Methods: We investigated 10 books and 1 paper about the ``accumulation point of extra meridians`` using several search engines and researched reason why the other 4 meridian do not have it. Results : All of the 16 accumulation points are located on the 4 limbs. The four limbs have more Yang energy than the trunk. The governor, conception, thoroughfare, and belt vessels do not flow in the limbs. It seems that there is no acupoint located on deep gap enough to be the accumulation point among the four vessels. When it comes to the functions of these vessels, they are little related with the acute pain that is the main target of the accumulation point. Conclusions: From the results of this study, it seems to be reasonable that the four vessels do not have accumulation point.