Abductor Pollicis Brevis

Joe Muscolino

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The abductor pollicis brevis of the intrinsic muscles of the hand. The transverse carpal ligament (flexor retinaculum) has been drawn in.

The Abductor Pollicis Brevis is a member of the Thenar Eminence Group of intrinsic muscles of the hand, composed of the:



  • The abductor pollicis brevis attaches from the transverse carpal ligament and the scaphoid and trapezium to the proximal phalanx of the thumb.
    • The transverse carpal ligament is also known as the flexor retinaculum.




NOTE: The abductor pollicis brevis is the most superficial of the three muscles of the thenar group.