[Location] Localized in the erect sitting position or supine position, on the medial aspect of the lower leg, 3 cun below SP9 (Yinlingquan), on the line connecting the tip of the medial malleolus and SP9 (Yinlingquan). (Fig.31)
[Regional Anatomy] Skin→subcutaneous tissue→gastrocnemius→soleus. Superficial layer, the medial crural cutaneous branch of the saphenous nerve, the greater saphenous vein; deep layer, the tibial nerve, and the posterior tibial artery and vein.