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

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

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

Answer: (A)

The bladder (UB) channel on the back is organized in two vertical lines relative to the midline: a medial line at about 1.5 cun from the midline (where BL-12 is located at T2) and a lateral line about 3 cun from the midline. At the same vertebral level, moving from the medial to the lateral line keeps the points in the same vertical position. So, at the level of the second thoracic vertebra, 3 cun lateral to the midline corresponds to BL-41, which sits on that lateral row aligned with BL-12 levelwise. In other words, the described location matches BL-41. BL-40 is far from this region (it’s in the popliteal crease), and BL-42 and BL-43 are at other thoracic levels along the lateral column, not at the exact level paired with BL-12. Memorizing this two-column layout (1.5 cun vs 3 cun from the midline) helps you place back-bladder points quickly.

The bladder (UB) channel on the back is organized in two vertical lines relative to the midline: a medial line at about 1.5 cun from the midline (where BL-12 is located at T2) and a lateral line about 3 cun from the midline. At the same vertebral level, moving from the medial to the lateral line keeps the points in the same vertical position. So, at the level of the second thoracic vertebra, 3 cun lateral to the midline corresponds to BL-41, which sits on that lateral row aligned with BL-12 levelwise.

In other words, the described location matches BL-41. BL-40 is far from this region (it’s in the popliteal crease), and BL-42 and BL-43 are at other thoracic levels along the lateral column, not at the exact level paired with BL-12. Memorizing this two-column layout (1.5 cun vs 3 cun from the midline) helps you place back-bladder points quickly.