[Location] Localized in the prone position. In the region of the sacrum, 0.5 cun lateral to the tip of the coccyx. (Fig.63)
 
[Regional Anatomy] Skin→subcutaneous tissue→the gluteus maximus→the tendon of the levator ani, Superficial layer, the distribution of the intermediate gluteal cutaneous nerve; deep layer, the branches or the subordiantial ramus of the inferior gluteal artery and vein, and inferior gluteal nerve.