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

• A. LI 6
• B. LI 5
• C. LI 4
• D. LI 7

Answer: (D)

Distances along a channel are measured in cun along the line from a distal point toward its proximal end. On the Large Intestine channel, starting at Yangxi (LI-5) and moving toward Quchi (LI-11) up the forearm, the point that sits 5 cun proximal to LI-5 is LI-7. So LI-7 is the location that matches the 5-cun mark from LI-5 along that line. Other options don’t fit: LI-4 is on the hand, LI-6 sits at a different proximal position on the forearm, and LI-11 is at the elbow itself, not at the 5-cun point from LI-5.