Which BL point is found in the depression below the bellies of the gastrocnemius muscle when the muscle is flexed, approximately 8 cun distal to BL40 and midway between BL40 and BL60?

• A. BL 56
• B. BL 60
• C. BL 58
• D. BL 57

Answer: (D)

This question tests precise location of a Bladder (BL) point on the posterior leg by using a clear bony landmark and exact measuring distance. The description places you in the hollow below the bellies of the gastrocnemius when the knee is flexed, about 8 cun below the knee crease point (BL40) and halfway to the next BL point toward the ankle (BL60). That exact spot is the point known as Chengjin on the Bladder channel. Because the location is defined by both the knee crease reference and the specific 8-cun distance toward the ankle, this point uniquely fits the description. The other nearby BL points sit at different depths or distances along the leg and would not match this precise location.