Which San Jiao point lies 7 cun proximal to SJ-4, on a line from SJ-4 to the lateral epicondyle of the humerus, in the depression between the radius and the ulna?

• A. SJ-8
• B. SJ-9
• C. SJ-10
• D. SJ-11

Answer: (B)

Locating San Jiao points uses fixed landmarks and a standard cun distance along a defined line. From SJ-4 at the wrist, follow a line up toward the elbow to the lateral epicondyle of the humerus. Seven cun proximal along that line lands in the hollow between the radius and the ulna on the forearm side of the elbow. That exact site is SJ-9. It sits in the interosseous depression between the two bones, on the described line, seven cun from SJ-4. The other elbow-area points sit at different positions along the line or at different distances, so they don’t fit this description.