[Location] Localized in the erect sitting position or supine position, on the medial aspect of the lower leg, 3 cun above the medial malleolus, on the posterior border of the medial aspect of the tibia. (Fig.31)
 
[Regional Anatomy] Skin→subcutaneous tissue→flexor digitorum longus→tibialis posterior--flexor hallucis longus. Superficial layer, the medial crural cutaneous branch of the saphenous nerve, the subordiantial ramus of the greater saphenous vein; deep layer, the tibial nerve, and the posterior tibia] artery and vein.