On the back, 3 cun lateral to the inferior border of the spinous process of the seventh thoracic vertebra (T7), at the level of BL-17 (Diaphragm Shu point).
🧭 How to find it (practical)
Seated with the head flexed, locate the point below the spinous process of the seventh thoracic vertebra, 3 cun lateral to Zhi Yang (GV-9), at the level of the inferior angle of the scapula.
🔬 Anatomy
Trapezius, latissimus dorsi, rhomboid major, and iliocostalis thoracis muscles. Innervated by the dorsal branches of the T7 and T8 thoracic nerves.
💉 Needling
Oblique insertion toward the spine, 0.3–0.5 cun.
📜 Etymology
Ge (膈), diaphragm; Guan (关), pass. The point lies at the level of Ge Shu (BL-17) and is the Dorsal Shu point of the Diaphragm.
