Which point is on the dorsal aspect of the second toe, at the junction of lines drawn along the lateral border of the nail and the base of the nail, approximately 0.1 cun from the corner of the nail?

• A. ST 45
• B. ST 44
• C. ST 43
• D. SP 2

Answer: (A)

The point being tested is the exact toe-point localization on the Stomach channel, specifically the one at the nail corner of the second toe. ST-45 is defined as the point on the dorsal aspect of the second toe, at the lateral border of the nail and the base of the nail, about 0.1 cun from the corner of the nail. This precise location is what distinguishes it from nearby points and matches the description given.

That’s why this option is the best choice: it corresponds exactly to the nail-corner area on the second toe. The other points are located between the toes or on the other toes, not at the nail corner of the second toe, so they don’t fit the described location.