Mnemonic-Radial nerve: muscles innervated

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In order of their innervation, proximal to distal:
Triceps
Anconeus
Brachioradialis
ext. Carpi radialis longus
ext. Carpi radialis brevis
Supinator
ext. Digitorum
ext.Digiti minimi
ext. Carpi ulnaris
Abductor poll. longus
ext. Poll. brevis
ext. Poll. longus
ext. Indicis

For simpler mnemonic refer the next post.