Which BL point is located 1.5 cun lateral to the lower border of the spinous process of the fifth lumbar vertebra?

Which BL point is located 1.5 cun lateral to the lower border of the spinous process of the fifth lumbar vertebra?

• A. BL 27
• B. BL 26
• C. BL 28
• D. BL 29

Answer: (B)

Locating back-point positions uses the vertebral level plus a standard lateral offset. On the bladder channel, the points along the lumbar region line up with the corresponding vertebrae, each situated about 1.5 cun to the side of the midline. At the level of the fifth lumbar vertebra, the point that sits 1.5 cun lateral to the lower border of the spinous process of L5 is BL 26. This fits the downward sequence of lumbar points from L2 to L5, where BL-23 is at L2, BL-24 at L3, BL-25 at L4, and BL-26 at L5. The other listed locations correspond to different vertebral levels (upper lumbar or sacral), so they would not be at L5. Therefore, the described location matches BL 26.

Locating back-point positions uses the vertebral level plus a standard lateral offset. On the bladder channel, the points along the lumbar region line up with the corresponding vertebrae, each situated about 1.5 cun to the side of the midline. At the level of the fifth lumbar vertebra, the point that sits 1.5 cun lateral to the lower border of the spinous process of L5 is BL 26. This fits the downward sequence of lumbar points from L2 to L5, where BL-23 is at L2, BL-24 at L3, BL-25 at L4, and BL-26 at L5. The other listed locations correspond to different vertebral levels (upper lumbar or sacral), so they would not be at L5. Therefore, the described location matches BL 26.