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Extrinsic muscles of the hand innervated by the radial nerve. extensor digitorum communis (EDC), extensor digiti minimi (EDM), extensor indicis, extensor pollicis longus (EPL), extensor pollicis brevis (EPB), abductor pollicis longus (APL).
The radial nerve is one of the final branches of the brachial plexus; it gets its input from the 5th, 6th, 7th and 8th cervical nerve roots. The radial nerve courses along the humerus in the upper arm. It wraps around the humerus in a spot called the spiral groove.Just before wrapping around the humerus, it sends a branch that innervates the triceps muscle (long, medial, and lateral heads) in the upper arm.he radial nerve is one of the final branches of the brachial plexus; it gets its input from the 5th, 6th, 7th and 8th cervical nerve roots. The radial nerve courses along the humerus in the upper arm. It wraps around the humerus in a spot called the spiral groove.