Muscles of the thumb

Intrinsic (thenar)
Abductor Pollicis Brevis
Adductor Pollicis
First Dorsal Interosseous
Flexor Pollicis Brevis
Opponens Pollicis
Extrinsic
Abductor Pollicis Longus
Extensor Pollicis Brevis
Extensor Pollicis Longus
Flexor Pollicis Longus

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