In the gluteal region, 3 cun lateral to the posterior midline, at the level of the fourth sacral foramen (at the level of BL-34).
🧭 How to find it (practical)
In ventral decubitus, locate the point at the level of the fourth posterior sacral foramen, 3 cun lateral to the posterior midline.
🔬 Anatomy
Gluteus maximus and piriformis muscles. The sciatic nerve passes deep to this point. Innervated by the inferior gluteal nerve.
💉 Needling
Perpendicular insertion, 1.5–2.0 cun.
📜 Etymology
Zhi (秩), in line, sequence; Bian (边), lateral. The Dorsal Shu points of the Bladder Meridian, Foot Tai Yang, are arranged in a sequence, and this is the most inferior of all of them.
