Which BL point is located 3 cun lateral to the midline at the level of the lower border of the spinous process of the second thoracic vertebra and level with BL-12?

Which BL point is located 3 cun lateral to the midline at the level of the lower border of the spinous process of the second thoracic vertebra and level with BL-12?

• A. BL 40
• B. BL 41
• C. BL 42
• D. BL 43

Answer: (B)

Understanding bladder-back point positions relies on two coordinates: distance from the midline and the vertebral level. BL-12 sits 1.5 cun lateral to the midline at the level of the lower border of the spinous process of the second thoracic vertebra. The points BL-41, BL-42, and BL-43 are located at the same thoracic region but farther from the midline, at about 3 cun lateral. The description given—same vertebral level as BL-12 but 3 cun from the midline—maps to BL-41. BL-40 is in the knee region (popliteal fossa), not the upper back. BL-42 and BL-43 are at other levels or offsets, not matching this exact combination of level and distance. So the point that fits this position most precisely is BL-41.

Understanding bladder-back point positions relies on two coordinates: distance from the midline and the vertebral level. BL-12 sits 1.5 cun lateral to the midline at the level of the lower border of the spinous process of the second thoracic vertebra. The points BL-41, BL-42, and BL-43 are located at the same thoracic region but farther from the midline, at about 3 cun lateral. The description given—same vertebral level as BL-12 but 3 cun from the midline—maps to BL-41.

BL-40 is in the knee region (popliteal fossa), not the upper back. BL-42 and BL-43 are at other levels or offsets, not matching this exact combination of level and distance. So the point that fits this position most precisely is BL-41.