Which San Jiao point lies 2 cun proximal to SJ-4, between the radius and ulna on the radial side of the extensor digitorum communis tendons?

• A. SJ-4
• B. SJ-5
• C. SJ-6
• D. SJ-7

Answer: (B)

The location described follows the forearm portion of the San Jiao channel. SJ-4 (Yangchi) sits at the wrist crease between the radius and ulna. Going 2 cun proximal from that point, along the radial (thumb) side of the extensor digitorum communis tendons, you reach the point known as Wai Guan. That specific spot—2 cun above SJ-4 on the radial side of the extensor digitorum communis tendons—is SJ-5.