Updated: 1/6/2016

Lateral Antebrachial Cutaneus Nerve

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Innervation
  • Motor
    • none
  • Sensory
    • radial forearm
  • Reflexes
    • none
Origin
  • C5,6,7 roots
    • brachial plexus
      • musculocutaneous nerve 
Course of Lateral Antebrachial Cutaneous Nerve
  • Originates from the musculocutaneous nerve
    • Passes behind the cephalic vein
    • Pierces the deep fascia lateral to the biceps tendon
    • Divides at the level of the elbow joint into volar and dorsal branches
Terminal Branches
  • Volar
    • runs distally along radial border of forearm, supplying lateral volar forearm skin sensation
    • small branches innervate the radial aspect of radiocarpal joint
    • ends in communicating branches to:
      • superficial branch of the radial nerve (dorsal radial thumb innervation)
      • palmar cutaneous branch of median nerve (volar radial thumb innervation)
  • Dorsal
    • runs distally along dorsal radial forearm, supplying dorsal-lateral cutaneous innervation
    • ends in communicating branches:
      • superficial radial nerve
      • dorsal antebrachial cutaneous branch of radial nerve
Nerve Injury & Clinical Conditions
  • Injury results in loss of sensation along the radial aspect of the forearm
 

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