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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 three meet and join to the olecranon of the ulna. When this muscle contracts, it pulls the olecranon in the direction of the shoulder-thus extending the forearm at the elbow joint. The triceps brachii muscle is innervated by the radial nerve, originating from spinal levels C6 and C8, but primarily C7.plit and merge into it. Answer by Qu.mstr. Confidence votes 360. The triceps brachii muscle is the primary extensor of the elbow, also known as the olecranon. To clarify, it is the elbow that can also be known as the olecranon.