Which BL point is on the lower leg, located in the depression between the two heads of the gastrocnemius and 2 cun inferior to Weizhong BL-40?

• A. Bl 55
• B. Bl 50
• C. Bl 54
• D. Bl 53

Answer: (A)

This question tests precise location along the Bladder channel using anatomical landmarks. The site described—an indentation between the two heads of the gastrocnemius on the lower leg, about 2 cun below the popliteal crease point BL-40 (Weizhong)—is the defining description of BL-55. Locate BL-40 at the center of the knee crease, then travel down the posterior calf two cun to land in the groove between the gastrocnemius heads, where BL-55 sits. Other points in the area sit at different landmarks or distances, so they don’t fit this exact description.