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Radial Nerve

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  • General[1]
    • Is one of the two terminal continuations of the posterior cord of the brachial plexus.
    • It receives contributions from C5-T1 nerve roots.
  • Course
    • The nerve arises in the axillary region,is located posterior to axillary artery.
    • It exits the axilla via the triangular interval to enter the posterior compartment of the arm.
    • The radial nerve then descends down the arm winding around the spiral groove of the humerus.
    • It enters the forearm by travelling anterior to the lateral epicondyle of the humerus, through the cubital fossa.
    • It divides into superficial and deep branches.


  • Muscular innervations
  • Sensory functions
    • Superficial branch of the radial nerve: cutaneous sensation to the dorsal aspect of the hand, dorsal aspect of the first to third digits and the dorsal lateral aspect of the fourth finger.
    • Lateral cutaneous nerve of arm: innervates the lateral aspect of the arm.
    • Posterior cutaneous nerve of arm: innervates the posterior surface of the arm.
    • Posterior cutaneous nerve of forearm: innervates the middle of the posterior forearm.

Vascular Supply

Clinical Significance

See Also


  1. Standring, Susan, and Henry Gray. 2008. Gray's anatomy: the anatomical basis of clinical practice.
Created by:
Alaa Khader on 23 May 2022 20:34:37
Last edited:
24 May 2022 12:18:34