Which SI point is midway between Nāoshū SI-10 and the spinous process of T2?

• A. SI 12
• B. SI 10
• C. SI 11
• D. SI 9

Answer: (A)

SI-12 sits in the infraspinous fossa of the scapula, in the region between the scapular spine downward toward the infraspinous area. Naóshū (SI-10) is on the scapula near the inferior edge of the scapular spine, and the spinous process of T2 is a fixed midline landmark behind the shoulder. The point that lies midway between SI-10 and the T2 spinous process falls into the infraspinous fossa, which is exactly where SI-12 is located. So SI-12 is the midpoint location on that line, whereas the other options are positioned higher on the scapula or in different parts of the shoulder region.