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Radial Nerve anatomy - Origin , Course , Relations , Branches ( Fast Track mode Not for beginners )

Origin
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Radial nerve originates from the posterior cord of the brachial plexus (C5-T1)
behind axillary artery

Course
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Posterior wall axilla
courses on the posterior wall of the axilla (on subscapularis, latissimus dorsi, teres major)

3 Branches in axilla
posterior cutaneous nerve of the arm
branch to long head of triceps
branch to medial head of triceps

Triangular interval
it then runs through the triangular interval with profunda brachii artery in posterior compartment between long head of triceps and humerus

Spiral groove
next it courses through the spiral groove between lateral and medial heads of triceps
bottom line = Safe zone posteriorly of 10 cm distal to the lateral acromion and 10 cm proximal to lateral epicondyle

branches in spiral groove
inferior lateral cutaneous nerve of the arm
posterior cutaneous nerve of the forearm
branch to lateral head of triceps
branch to medial head of triceps and anconeus

Lateral intermuscular septa

next it passes through the lateral intermuscular septa never less than 7.5 cm above the distal articular surface.
runs between brachialis and brachioradialis (anterior to lateral epicondyle)
gives branches to supply: lateral brachialis, brachioradialis, ECRL, ECRB
Terminal branches
level of radiohumeral joint line, divides into terminal branches
superficial sensory branch
Deep branch/PIN
ECRB branch

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