Abductor Pollicis Brevis

Written by Oliver Jones

Last updated October 12, 2022 • 3 Revisions •

The abductor pollicis brevis is a thenar muscle located within the hand. It forms the anterolateral aspect of the thenar eminence, overlying the opponens pollicis.

  • Attachments: Originates from the tubercles of the scaphoid and trapezium and from the associated flexor retinaculum. Attaches to lateral aspect of the proximal phalanx of the thumb.
  • Actions: Abduction of the thumb.
  • Innervation: Median nerve (recurrent branch)
  • Blood supply: Superficial palmar arch

Figure 1
Palmar view of the thenar muscles.

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