Innervation Motor login to view 15 more bullets Sensory login to view 4 more bullets Origin Radial nerve originates from the posterior cord of the brachial plexus (C5-T1) login to view 1 more bullet Course Posterior wall axilla login to view 5 more bullets Triangular interval login to view 1 more bullet Spiral groove login to view 7 more bullets Lateral intermuscular septa login to view 3 more bullets Terminal branches login to view 4 more bullets Injury & Clinical Conditions PIN compression Syndrome Radial Tunnel Syndrome Radial claw hand login to view 1 more bullet