Which acupuncture point is located on the medial aspect of the lower leg, 5 cun superior to Taixi (KID-3), on the line to Yongquan (KID-10), approximately 1 cun posterior to the medial border of the tibia?

• A. KD-9
• B. KD-3
• C. REN-2
• D. KD-12

Answer: (A)

This question tests precise point location along the Kidney meridian on the medial leg using cun measurements and fixed landmarks. Taixi (Kidney 3) sits at the medial ankle, and Yongquan (Kidney 1) is at the sole. From Taixi, moving 5 cun upward along the line toward Yongquan traces the Kidney channel up the medial leg. About 1 cun posterior to the medial border of the tibia on that line is Kidney 9. So the described spot—the medial aspect of the lower leg, 5 cun above Taixi, on the line to Yongquan, about 1 cun behind the tibial border—corresponds to Kidney 9.

The other points mentioned sit in different regions: Kidney 3 is at the ankle, Kidney 12 is on the abdomen, and Ren 2 is on the midline of the lower abdomen, not along the medial lower leg path described.