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Updated: Apr 9 2017

Musculocutaneous Nerve

Images musculocutaneus nerve.jpg musculocutaneus nerve with biceps.jpg Plexus with sensory 566_moved.jpg nerve.jpg
  • Innervation
    • Motor
    • Sensory
      • lateral antebrachial cutaneous nerve
        • forearm sensory
  • Origin
    • C5,6,7
      • superior trunk
        • lateral cord
          • musculocutaneous nerve
            • branch to coracobrachialis
            • branch to biceps
            • branch to brachialis
              • lateral antebrachial cutaneous nerve (terminal branch)
  • Course
    • Pierces Coracobrachialis
      • pierces coracobrachialis 3-8 cm distal to coracoid
      • gives branch to coracobrachialis
    • Splits biceps and brachialis
      • runs between biceps and brachialis in the anterior compartment to enter the lateral aspect of the arm
      • gives branch to biceps and brachialis
    • Pierces deep fascia lateral to biceps brachii
      • a little above the elbow it pierces the deep fascia lateral to the tendon of the biceps brachii
    • Becomes lateral antebrachial cutaneous nerve (terminal branch)
      • emerges lateral to distal bicep tendon and brachoradialis to form lateral antebrachial cutaneous nerve
  • Injury & Clinical Conditions
    • Musculocutaneous Nerve Inury
      • usually iatrogenic during deltopectoral approach with dissection or retraction medial to conjoint tendon
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