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Posterior brachial muscles
The posterior compartment develops into two muscles, the largest muscle of the brachium – the triceps brachii and the smallest muscle of the brachium – the articularis cubiti. The three headed triceps muscle assists the deltoid with shoulder extension. In addition this large muscle is the primary extensor of the elbow joint. The three heads join to form a broad flat aponeurosis at the distal end of the muscle. The nerve supply to the muscle is from the large terminal branch of the posterior cord of the brachial plexus – the radial nerve.