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

• A. ST 42
• B. ST 45
• C. ST 44
• D. SP 1

Answer: (B)

The main idea here is using precise nail-bed landmarks to locate a point on the toe. When you map a point on the dorsal surface of the big toe, you identify it by tracing lines along the nail’s medial border and the base of the nail and then measuring about 0.1 cun from the inner corner. That exact spot corresponds to a Stomach channel point on the dorsal aspect of the big toe in standard charts, making it the best match for this description. The other options lie in different positions along the toe or belong to different meridians, so they don’t fit the described nail-bed landmark as precisely.