Which San Jiao point sits on the upper arm along a line between Tianjin SJ-10 and Jianliáo SJ-14, 4 cun proximal to Tianjin SJ-10 and 6 cun distal to Jianliáo SJ-14?

• A. SJ-10
• B. SJ-11
• C. SJ-12
• D. SJ-3

Answer: (C)

Understanding how the San Jiao channel runs along the arm helps locate these points. The SJ channel on the upper arm travels along a line from the elbow area toward the shoulder, with points spaced in reference to SJ-10 near the elbow and SJ-14 higher up toward the shoulder. Distances along the channel are counted in cun from known points. If a point is four cun from SJ-10 and six cun from SJ-14, it falls in the middle portion of that upper-arm segment. That position corresponds to Xiaoliao, SJ-12. So SJ-12 is the point described.