[Location] Localized in the erect sitting position, on the junction of the red and white skin, in front of the articulation metacarpophalangea of middle finger and ring finger. (Fig. 106 )
 
[Regional Anatomy] Skin→subcutaneous tissue→dorsal interossei→musculi interossei palmares→lumbrical muscles. Superficial layer, the distribution of dorsal metacarpal arteries and veins, dorsal digital arteries and veins, and dorsal digital nerves; deep layer, the distribution of arteriae digitales palmares communes, venae digitales volares communes, proper palmar digital arteries and veins and proper pahnar digital nerves.