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The Flexor Pollicis Brevis is a member of the Thenar Eminence Group of intrinsic muscles of the hand, composed of the:
- Abductor pollicis brevis
- Flexor pollicis brevis
- Opponens pollicis
- The flexor pollicis brevis attaches from the transverse carpal ligament and the trapezium to the proximal phalanx of the thumb.
- The transverse carpal ligament is also known as the flexor retinaculum.
- Flexes the thumb at the carpometacarpal joint.
- Abducts the thumb at the carpometacarpal joint.
- Flexes the thumb at the metacarpophalangeal joint.
NOTE: There is a sesamoid bone in the distal tendon of the flexor pollicis brevis.