Which SI point is 3 cun lateral to the lower border of the spinous process of T1?

• A. SI 13
• B. SI 12
• C. SI 11
• D. SI 14

Answer: (A)

The back-point locations on the Small Intestine meridian are described using precise spinal landmarks and a transverse distance from the spine. A point described as “3 cun lateral to the lower border of the spinous process of T1” sits in the scapular region, on the medial side near the first thoracic vertebra level. That exact description matches SI 13, which is placed in a depression along the medial border of the scapula at that level. The other options correspond to nearby areas but do not align with that specific T1 level and 3-cun offset, so they don’t fit the landmark given.