Muscles of the Thumb

Abductor Pollicis Brevis (APB)

Prime mover for abduction, and opposition of the carpometacarpal and abduction of the metacarpalphalange. Location: Volar, radial side. Thenar Muscle

Abductor Pollicis Longus (APL)

Prime mover for extension and abduction of the carpometacarpal. Location: Dorsal, radial side Part of the Anatomical Snuffbox

Flexor Pollicis Brevis (FPB)

Prime mover for flexion, abduction, and opposition of the carpometacarpal and flexion of the metacarpalphalange. Location: Volar, radial side. Thenar Muscle

Adductor Pollicis (AP)

Prime mover for flexion, adduction, and opposition of the carpometacarpal and flexion and adduction of the metacarpalphalange. Location: Volar, radial side Thenar Muscle

Flexor Pollicis Longus (FPL)

Prime mover for flexion, adduction, and opposition of the carpometacarpal, flexion of the metacarpalphalange, and flexion of the interphalange. Location: Volar, radial side

Opponens Pollicis (OP)

Prime mover for opposition of the carpometacarpal. Location: Volar, radial side. Thenar Muscle

Extensor Pollicis Brevis (EPB)

Prime mover of extension for the carpometacarpal and metacarpalphalanges. Assists with abduction of the carpometacarpal Location: Dorsal, radial side. Part of the Anatomical Snuffbox

Extensor Pollicis Longus (EPL)

Prime mover of extension for the carpometacarpal, metacarpalphalanges, and interphalanges and abbuction of the carpometacarpal. Location: Dorsal, radial side Part of the Anatomical Snuffbox