Dorsal interossei

Schematic anatomy
Deep layerDorsal interossei

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

Dorsal interossei

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Spread the fingers apart and assist knuckle control.

01

Resisted finger spread

Finger abduction · Light band

Also works

Abductor digiti minimi; finger extensors stabilize

How to perform

Spread your fingers apart against a light loop, then bring them back under control.

Keep the wrist still and fingers comfortably extended.

Example volume · 1–2 sets × 8–12 reps

Referenceswww.guysandstthomas.nhs.uk

Community draft · awaiting expert review