Flexor pollicis brevis muscle

Last revised by Daniel MacManus on 2 Aug 2021

The flexor pollicis brevis muscle is a short muscle of the thenar eminence located distal to the abductor pollicis brevis. It is one of the intrinsic muscles of the hand. The muscle is composed of a superficial head and a variably sized deep head.


  • origin:
  • insertion: proximal phalanx of the thumb
  • action: flexes thumb at metacarpophalangeal joint
  • arterial supply: superficial palmar arch
  • innervation:

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