Which BL point is found on the back of the thigh in the depression between the hamstring muscles, 6 cun distal to BL36 and 8 cun proximal to BL40 along the line from BL36 to BL40?

• A. BL 36
• B. BL 37
• C. BL 38
• D. BL 39

Answer: (B)

The place described is a specific spot on the posterior thigh along the Bladder (UB) channel, between the two ends of the line from BL36 to BL40. On this line, BL37 sits in the hollow between the hamstring muscles, roughly midway between BL36 up high on the thigh and BL40 at the popliteal crease. Saying it is 6 cun distal to BL36 and 8 cun proximal to BL40 pins it to BL37, because that point is positioned in that middle region where the hamstrings form a natural depression.

So, the point matching this description is Qiuxu (BL37). BL36 is higher up the thigh, BL40 is at the knee crease, and the other two points along that line are located at different spots and don’t fit the described location as precisely.