Which BL point is 1.5 cun lateral to the lower border of the spinous process of the first thoracic vertebra (T1)?

• A. BL-10
• B. BL-12
• C. BL-11
• D. BL-13

Answer: (C)

Back Shu points on the Bladder channel are located 1.5 cun lateral to the spinous process at the corresponding vertebral level. The description given—1.5 cun lateral to the lower border of the spinous process of the first thoracic vertebra—maps precisely to the point BL-11, also known as Da Zhu (Great Shuttle), the bone-influencing point. That exact location distinguishes it from the others, which lie at adjacent levels (BL-12 near the next vertebra, BL-13 at the following one) or higher up near the neck (BL-10). So the described position identifies BL-11.