Adductor Pollicis Anatomy

Adductor Pollicis O, I, A

Origin:  Transverse head: distal two-thirds of the palmar surface of the third metacarpal.
Oblique head: volar surface of the capitate, the bases of the second and third metacarpals, the palmar carpal ligaments, and the tendon sheatah of flexor carpi radialis.
Insertion:  Medial aspect of the base of the proximal phalanx and the medial sesamoid of the metacarpophalangeal joint of the thumb
Actions: Radial adduction of the thumb
Innervation: Ulnar nerve (C8, T1)
Blood Supply: Superficial palmar branches of the radial artery

Primary Actions of the Adductor Pollicis

1. Radial adduction of the thumb at the trapeziometacarpal joint

  Agonists:

  • None

  Antagonists:

  • Abductor Pollicis Longus

2. Palmar adduction and rotation of the thumb at the trapeziometacarpal joint

  Agonists:

  • None

  Antagonists:

  • Abductor Pollicis Longus

3. Flexion of the thumb at the carpometacarpal joint

  Agonists: 

  • Opponens Pollicis
  • Flexor Pollicis Longus
  • Flexor Pollicis Brevis

  Antagonists:

  • Abductor Pollicis Longus
  • Extensor Pollicis Brevis

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