Thumb Motion MCP IP Extension Extensor Pollicis Brevis (EPB) Extensor Pollicis Longus (EPL) Abductor Pollicis Longus (APL) EPL Flexion Flexor Pollicis Brevis (FPB) FPL Abduction APL Abductor Pollicis Brevis NA Adduction Adductor Pollicis NA Opposition Opponens Pollicis NA