For many unlucky folks that would be the
- extensor carpi radialis longus
- extensor carpi radialis brevis
- extensor carpi ulnaris
- extensor digitorum
- extensor indicis
- extensor digiti minimi
- abductor pollicis longus
- extensor pollicis brevis
- extensor pollicis longus
- lumbricals
- dorsal interossei
- palmar interossei
- etc. There are many muscles at work during this action.




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