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As part of the Brachial Plexus, the Musculocutaneous Nerve is a major peripheral nerve of the upper limb. It innervates muscles of the anterior arm that flex the upper arm at the shoulder and the elbow, and assists in supinating the forerarm. Nerve Root: C5-7 Motor: Corocobrachialis, Biceps Brachii, and Brachialis. Sensory: Lateral Forearm