[Location] Localized in the prone position. In the region of the sacrum. 3 cun lateral to the middle sacral crest, at the level of the fourth posterior sacral foramen. (Fig. 66 )
 
[Regional Anatomy] Skin→subcutaneous tissue→the gluteus maximus→the gluteus medius→the gluteus minimus. Superficial layer, the distribution of the intermediate and inferior gluteal cutaneous nerves; deep layer, the superior and inferior gluteal arteries and veins, and nerves.