[Location ] Localized with the index finger extended, on the radial side of the distal phalanx of the index finger, 0.1 cun distance from the corner of the nail. ( Fig. 11 )
 
[Regional Anatomy] Skin→subcutaneous tissue→the base of nail. The palmar digital proprial nerve derived from the median nerve, and the arterial and venous network formed by the radial-side artery and vein, and the branches of the palmar's first back artery and vein.