- Is one of the two terminal continuations of the posterior cord of the brachial plexus.
- It receives contributions from C5-T1 nerve roots.
- 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.
- Standring, Susan, and Henry Gray. 2008. Gray's anatomy: the anatomical basis of clinical practice.