Radial nerve: Deep & Posterior interosseous branches

Spinal cord segments

C5
C6
C7
C8

Muscles innervated
extensor carpi radialis brevis (deep branch)
supinator (deep branch)
extensor digitorum (posterior interrosseous)
extensor digiti minimi (posterior interosseous)
extensor carpi ulnaris (posterior interosseous)
abductor pollicis longus posterior interosseous)
extensor pollicis longus (posterior interosseous)
extensor pollicis brevis (posterior interosseous)
extensor indicis (posterior interosseous)