Which point is on the ulnar border of the hand, between the base of the fifth metacarpal bone and the triquetral bone?

• A. SI 1
• B. HT 4
• C. SI 4
• D. SI 3

Answer: (C)

This question tests knowing the exact land-mark for a point on the ulnar border of the hand. The depression between the base of the fifth metacarpal and the triquetral bone is the classic site of Small Intestine point four. It sits on the ulnar edge of the hand and is also known as the Yang Gate, as well as the Yuan Source point for the Small Intestine channel. That specific anatomical location distinguishes it from other points that lie at different spots (for example, points located at the fingertip or at other wrist/hand sites). So the point described is the Small Intestine point four.