Which point is 3 cun proximal to Yángxī L.I.-5 on the line connecting Yángxī L.I.-5 with Qūchí L.I.-11?

• A. LI 7
• B. LI 5
• C. LI 6
• D. LI 8

Answer: (C)

In acupuncture, distances along a channel are measured in cun, and you locate points by following the channel from a starting point toward its destination. For the Large Intestine channel, moving proximally from LI-5 (on the radial wrist) toward LI-11 (at the elbow) you encounter LI-6 first, then LI-7, then LI-8 as you go up the forearm. The point that sits 3 cun from LI-5 along that line is LI-6. So LI-6 is the correct choice because it is the first next point along the LI channel at the 3-cun mark from LI-5. LI-7 and LI-8 are located farther up the line, beyond that 3-cun point, and LI-5 is the starting point itself, not at a 3-cun distance.