Flexor pollicis brevis

Schematic anatomy
Deep layerFlexor pollicis brevis

Arms

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Biceps

Long headShort headBrachialis · supporting muscle

Triceps

Long headLateral headMedial head

Forearms

BrachioradialisFlexor carpi radialisFlexor carpi ulnarisFlexor digitorum superficialisFlexor digitorum profundusFlexor pollicis longusExtensor carpi radialis longus & brevisExtensor carpi ulnarisExtensor digitorumExtensor pollicis longus & brevisAbductor pollicis longusPronator teresPronator quadratusSupinator

Hands

Abductor pollicis brevisFlexor pollicis brevisOpponens pollicisAdductor pollicisHypothenar musclesLumbricalsDorsal interosseiPalmar interossei
Movement guide

Flexor pollicis brevis

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Bends the thumb at its large knuckle.

01

Thumb putty press

Thumb flexion · Soft putty

Also works

Flexor pollicis longus, other thenar muscles

How to perform

Press your thumb into soft putty toward the palm, then release.

Keep the thumb joints aligned; do not force the end position.

Example volume · 1–2 sets × 8–12 gentle reps

Referenceswww.guysandstthomas.nhs.uk

Community draft · awaiting expert review