Opponens Pollicis Anatomy

Opponens Pollicis O, I, A

Origin: Distal border of the flexor retinaculum and the trapezium
Insertion:  Lateral aspect of the first metacarpal
Actions: Opposition of the thumb toward the digits
Innervation: Median nerve (C8, T1)
Blood Supply: Superficial palmar branches of the radial artery

Primary Actions of the Opponens Pollicis

1. Opposition of the thumb toward the digits

  Agonists:

  • Abductor Pollicis Brevis
  • Adductor Pollicis
  • Flexor Pollicis Brevis

  Antagonists:

  • Extensor Pollicis Longus
  • Extensor Pollicis Brevis
  • Abductor Pollicis Longus

2. Flexion of the thumb at the carpometacarpal joint

  Agonists:

  • Adductor Pollicis
  • Flexor Pollicis Longus
  • Flexor Pollicis Brevis

  Antagonists:

  • Abductor Pollicis Longus
  • Extensor Pollicis Brevis

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