Which BL point is located 3 cun lateral to the midline, level with the lower border of the spinous process of the fourth thoracic vertebra and BL-14?

Which BL point is located 3 cun lateral to the midline, level with the lower border of the spinous process of the fourth thoracic vertebra and BL-14?

• A. BL 41
• B. BL 42
• C. BL 44
• D. BL 43

Answer: (D)

BL channel back points along the spine are spaced so that 3 cun lateral to the midline at specific thoracic levels lines up with each vertebra. At the level of the lower border of the fourth thoracic vertebra (T4), the point 3 cun lateral to the midline corresponds to BL-43. BL-14 sits on the same horizontal level (T4) but only 1.5 cun lateral to the midline, making it a different point. The other options sit at neighboring thoracic levels (closer to T2, T3, or T5) and thus do not match the 3-cun lateral position at T4. Therefore, the point described is BL-43.

BL channel back points along the spine are spaced so that 3 cun lateral to the midline at specific thoracic levels lines up with each vertebra. At the level of the lower border of the fourth thoracic vertebra (T4), the point 3 cun lateral to the midline corresponds to BL-43. BL-14 sits on the same horizontal level (T4) but only 1.5 cun lateral to the midline, making it a different point. The other options sit at neighboring thoracic levels (closer to T2, T3, or T5) and thus do not match the 3-cun lateral position at T4. Therefore, the point described is BL-43.