Opponens pollicis (OP) Anatomy
- Origin: Trapezium bone and flexor retinaculum.
- Insertion: Radial side of the shaft of the first metacarpal bone.
- Innervation: Median nerve.
- Nerve: Recurrent motor branch of the median nerve
Diagrams & Photos
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Opponens pollicis (OP) with abductor pollicis brevis folded proximally. Note relationship of FPL to thenar muscles.
Key Points
- Opponens pollicis (OP) inserts along the dorsal radial border of the thumb metacarpal bone.