Radial nerve

Plexus: Brachial
Cord: Posterior
Roots: C5C6C7C8
Origin: Posterior cord of brachial plexus

Motor innervation:

Triceps, medial head
Roots: C6C7
Triceps, lateral head
Roots: C6C7, C8
Triceps, long head
Roots: C7C8
Brachioradialis
Roots: C5C6
Extensor carpi radialis longus
Roots: C6C7
Extensor carpi radialis brevis
Branch: Posterior interosseous nerve
Roots: C6C7
Supinator
Branch: Posterior interosseous nerve
Roots: C6
Extensor carpi ulnaris
Branch: Posterior interosseous nerve
Roots: C7C8
Extensor digitorum
Branch: Posterior interosseous nerve
Roots: C6C7, C8
Extensor digiti minimi
Branch: Posterior interosseous nerve
Roots: C7C8
Abductor pollicis longus
Branch: Posterior interosseous nerve
Roots: C7C8
Extensor pollicis longus
Branch: Posterior interosseous nerve
Roots: C7C8
Extensor pollicis brevis
Branch: Posterior interosseous nerve
Roots: C7C8
Extensor indicis
Branch: Posterior interosseous nerve
Roots: C7C8

Sensory innervation:

Arm, forearm and distal phalanges
Branch: Posterior brachial and antebrachial cutaneous nerves
Roots: C5C6C7C8

Syndromes:

Axillary level lesions
Posterior cutaneous nerve lesion
Lesion at spiral groove level
Posterior interosseous nerve lesion
Cheiralgia paresthetica
Dorsal digital nerves lesion
Pseudoradial palsy