On the dorsal midline in the depression between the processus spinosus of the S5 and Cd1 vertebrae.Single point (Figs.106，107;23#).Perpendicular insertion.Filiform needle 0.5-1cm，or moxibustion with mugwort.Indications：Paralysis of the pelvic limb，paralysis of the tail，prolapse of anus，constipation or diarrhea.