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 branch of the median nerve
Diagrams & Photos
  • Opponens pollicis (OP) with abductor pollicis brevis folded proximally. Note relationship of FPL to thenar muscles.
    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.

Anatomy References
Anatomic Abbreviations
Hand Surgery Resource Anatomy Diagnostic Guide (Chapter)