B57 Chengshan ( V57 )

Location Directly below the belly of m . gastrocnemius , on the line joining B40 and tendo calcaneus , about 8 cun below B40

Indications Low back pain , spasm of the gastrocnemius , hemorrhoids , constipation , beriberi .

Method Puncture perpendicularly - 0 . 8 - - 1 . 2 inches . Moxibustion is applicable

Vasculature The small saphenous vein ; deeper , the posterior tibial artery and vein .

Innervation The medial sural cutaneous nerve ; deeper , the tibial nerve .