Which SI point lies on a line between SI 5 and SI 8, 5 cun proximal to SI 5?

• A. SI 7
• B. SI 6
• C. SI 9
• D. SI 5

Answer: (A)

The question tests how to locate points along a channel using fixed distances along the limb. On the Small Intestine channel, moving from SI5 toward SI8 along the forearm, the points sit in sequence (SI6, SI7, then SI8). A location 5 cun proximal to SI5 on that line corresponds to SI7. So SI7 is the point described by “on a line between SI5 and SI8, 5 cun proximal to SI5.” This uses the standard cun measurement along the channel, not by surface landmarks alone.