Which SI point lies on a line connecting SI 5 and SI 8, 5 cun proximal to SI 5, in the groove between the anterior border of the ulna and the muscle belly of flexor carpi ulnaris?

• A. SI 5
• B. SI 12
• C. SI 9
• D. SI 7

Answer: (D)

The line of the Small Intestine points along the ulnar side of the forearm uses cun measurements to locate neighboring points. From SI 5 at the wrist, moving 5 cun proximally along the same line toward SI 8 places a point in the groove between the anterior border of the ulna and the belly of the flexor carpi ulnaris. That exact spot is SI 7, a point used for elbow and arm issues and located in that forearm groove. The other forearm points in this region sit in different locations and do not match this specific 5-cun proximal position along the SI line.