Radial nerve Anatomy - Origin, Course, innervation, Saturday night palsy, Wartenberg’s syndrome

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Key facts about the radial nerve

Origin
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Posterior cord of the brachial plexus (from the ventral rami of C5-T1)

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

Sensory innervation
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Inferior lateral cutaneous nerve of arm: lower outer aspect of the arm
Posterior cutaneous nerve of the arm: posterior surface of the arm
Posterior cutaneous nerve of the forearm: central, posterior aspect of the forearm
Superficial branch of the radial nerve: thenar eminence and dorsal aspect of the radial 3 and half digits of the hand
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