Version May 2024
| Muscle | Function |
| Extensor pollicis longus (EPL) | Extends IP joint |
| Flexor pollicis longus (FPL) | Flexes IP joint |
| Extensor pollicis brevis (EPB) | Extends MCP joint |
| Flexor pollicis brevis (FPB) | Flexes MCP joint |
| Abductor pollicis longus (APL) Abductor pollicis brevis (APB) | Abducts thumb metacarpal |
| Adductor pollicis (AP) | Adducts thumb metacarpal |
| Opponens pollicis (OP) | Flexes and abducts thumb metacarpal (pinch with little finger isolates OP) |
| First interosseus | Works with OP to enable pinch against index finger |
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