Which BL point is located on the lower leg, at the center of the belly of the gastrocnemius muscle, 5 cun below BL40 and midway between BL55 and BL57?

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

Answer: (A)

Locating a Bladder channel point relies on clear body landmarks and fixed body measurements along the leg. BL40 sits at the popliteal crease, so 5 cun below BL40 puts you down the back of the leg into the calf, precisely where the belly of the gastrocnemius lies. When you’re midway between BL55 and BL57, you’re choosing the central spot in that same muscular area. That combination points to BL56, which is specifically described as being in the center of the gastrocnemius belly, 5 cun below BL40. The other options sit at different parts of the calf/ankle region, not in the central gastrocnemius belly defined by these landmarks, so they don’t match this location.