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Extrinsic muscles of the hand innervated by the radial nerve. extensor digitorum communis (EDC), extensor digiti minimi (EDM), extensor indicis, extensor pollicis longus (EPL), extensor pollicis brevis (EPB), abductor pollicis longus (APL).
The radial nerve straightens the arm by causing the triceps muscle at the back of the arm to contract. If the nerve is injured before it supplies the triceps, the arm will be weak when pushing something away. Finger extensors will also be weak, making it challenging to fully open the hand.