Course Origins arises from the median nerve at the radiohumeral joint line C5-T1 roots medial and lateral cord of brachial plexus median nerve AIN branch to FDP branch to FPL branch to pronator quadratus Course arises 5-8 cm distal to lateral epicondyle passes between two heads of pronator teres runs along the volar surface of the FDP courses distally along the interosseous membrane terminates in PQ near wrist joint Motor Innervation Motor deep forearm muscles flexor digitorum profundus - radial half flexor pollicis longus pronator quadratus Sensory Innervation Sensory sensory fibers to volar wrist joint capsule no cutaneous innervation Clinical Conditions AIN compressive neuropathy Pediatric supracondylar fractures