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Musculocutaneous nerve lesion

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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The musculocutaneous nerve is a branch of the outer cord of the brachial plexus, carrying fibres from C5 and C6. It innervates the principal flexors of the elbow, biceps and brachialis. Injuries other than from direct trauma are rare.

Lesions produce:

  • weakness of elbow flexion and forearm supination
  • sensory loss over the lateral and volar aspect of the forearm
  • an absent biceps reflex

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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