Muscles which produce interphalangeal joint extension

Thumb: the Extensor Pollicis Longus, the Abductor Pollicis Brevis and the Adductor Pollicis through the Thumb extensor mechanism

Finger interphalangeal extension is through the digital extensor mechanism

Index, middle, ring and small: all Interossei, all Lumbricals, and the Extensor Digitorum Communis

Index: Extensor Indicis

Small: the Abductor Digiti Minimi and the Extensor Digiti Minimi

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