On the anterior aspect of the thigh, 3 cun above the superolateral border of the patella, in a depression between the rectus femoris and vastus lateralis muscles.
🧭 How to find it (practical)
Seated, with the knee flexed, locate the point 3 cun above the superolateral border of the patella.
🔬 Anatomy
Tendon of the rectus femoris, vastus lateralis. Innervated by the femoral nerve.
💉 Needling
Perpendicular insertion 1.0–1.5 cun.
📜 Etymology
Yin (阴), genital region; Shi (市), garment that covers the genital area. The point lies at the inferior border of this ancient undergarment.
