Muscles which produce MCP joint abduction

(Note: by convention, digital abduction is defined as movement away from the middle finger ray, not laterally away from the trunk)

Digit radial deviation
Digit ulnar deviation
Thumb: Abductor Pollicis Brevis

Index: First Dorsal Interosseous

Ring: Fourth Dorsal Interosseous

Small: Abductor Digiti Minimi

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