On the inner (anterolateral) aspect of the upper arm, along the radial border of the biceps brachii, 4 cun distal to the anterior axillary fold (or 5 cun above the cubital crease).
🧭 How to find it (practical)
Seated, locate the point 5 cun above the cubital crease, lateral to the tendon of the biceps brachii.
🔬 Anatomy
Skin, subcutaneous tissue, lower lateral cutaneous nerve of the forearm, cephalic vein, biceps brachii and brachialis muscles, radial collateral artery.
💉 Needling
Perpendicular (vertical) insertion 0.5–1 cun.
📜 Etymology
Xia (俠), to clasp on both sides; Bai (白), white. The color white relates to the Lung. With the arms relaxed, the Lung is encircled by the two Xia Bai (LU-4) points.
