Which BL point is 1.5 cun posterior to BL-5, 2.5 cun within the anterior hairline and 1.5 cun lateral to the midline?

• A. BL-6
• B. BL-5
• C. BL-7
• D. DU-20

Answer: (A)

Focusing on precise scalp localization, points on the bladder channel are defined by measurements from landmarks like the midline and hairline. If a point sits 1.5 cun behind BL-5, 2.5 cun inside the anterior hairline, and 1.5 cun to the side of the midline, that places it in the frontal-scalp region of the bladder channel. That combination of distances corresponds specifically to BL-6, which is located in that frontoparietal forehead area along the channel.

The other named points lie in different regions along the scalp or midline regions and do not match this particular frontal, lateral coordinate pattern, which is why they aren’t the correct choice.