Which BL point is located 3 cun lateral to the midline, level with the lower border of the spinous process of the first lumbar vertebra and aligns with Sanjiaoshu BL-22?

Which BL point is located 3 cun lateral to the midline, level with the lower border of the spinous process of the first lumbar vertebra and aligns with Sanjiaoshu BL-22?

• A. Bl 46
• B. Bl 50
• C. Bl 52
• D. Bl 53

Answer: (B)

The location relies on how back-shu and BL points are laid out along the spine: they are set at specific vertebral levels and a defined distance from the midline. The Sanjiao Shu point (BL-22) is at the level of the lower border of the spinous process of the first lumbar vertebra and 1.5 cun to the side of the midline. The point described as being 3 cun to the side of the midline at the same vertebral level aligns with the BL channel in that lumbar region and is designated BL-50. So, BL-50 sits in that exact position, directly in line with BL-22.

The location relies on how back-shu and BL points are laid out along the spine: they are set at specific vertebral levels and a defined distance from the midline. The Sanjiao Shu point (BL-22) is at the level of the lower border of the spinous process of the first lumbar vertebra and 1.5 cun to the side of the midline. The point described as being 3 cun to the side of the midline at the same vertebral level aligns with the BL channel in that lumbar region and is designated BL-50. So, BL-50 sits in that exact position, directly in line with BL-22.