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Key facts about the radial nerve

Origin

The posterior cord of the brachial plexus (from the ventral rami of C5T1)

Muscular innervation

Arm muscles: triceps, anconeus, brachioradialis,
Forearm muscles: extensor carpi radialis longus, extensor carpi radialis brevis, supinator, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, extensor indicis

Mnemonic

'Radial nerve innervates the BEST muscles' (Brachioradialis, Extensors, Supinator, Triceps)

Sensory innervation

The inferior lateral cutaneous nerve of arm: lower outer aspect of the arm
The posterior cutaneous nerve of the arm: posterior surface of the arm
The posterior cutaneous nerve of the forearm: central, posterior aspect of the forearm
The superficial branch of the radial nerve: thenar eminence and dorsal aspect of the radial 3 and a half digits of the hand


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