RADIAL NERVE

RADIAL NERVE:-
INTRODUCTION:
  • Derived from C5,6,7,8, T1
  • Largest branch of brachial plexus & arises from the posterior cord of brachial plexus.
  • In the lower part of axilla, the third part of the axillary artery is related anterior to the radial Nerve.
  • The lower lateral cutaneous nerve of the arm supplies the skin covering the lower half of the deltoid and upper part of the long head of the triceps.
  • Ulnar collateral branch of the radial nerve accompany the ulnar nerve in tha arm Et supplies the medial head of the triceps.
  • It lies in spiral groove of humerus.
SUPPLIES:
  • Extensor compartment of arm, forearm (skin)
  • Triceps
  • Anconeus and extensors of forearm. Extension of MCP joint
BRANCHES:
BRANCHES OF RADIAL NERVE ABOVE ELBOW
Above spiral groove
Triceps [long head]
Posterior cutaneous nerve of arm
In Spiral groove (sensory):
Posterior cutaneous nerve of forearm
Lower lateral cutaneous nerve of arm
Anconeus [through branch to medial head]
Medial Et lateral heads of triceps

Between spiral groove a lateral epicondyle:
Brachialis
Brachioradialis
Extensor carpi radialis longus
Branch below elbow - Posterior interosseous nerve
MUSCULAR INNERVATIONS:
  • Medial Muscular Branch:
  • Supplies medial head of the Triceps brachii(lies close to the ulnar nerve so k/a the ulnar collateral nerve).
  • Posterior Muscular Branch:
  • Supplies the medial and lateral heads of the Triceps brachii and the Anconeus muscles.
  • Lateral Muscular Branch:
  • The lateral muscular branches supplies Brachioradialis, Extensor carpi radialis longus, and the lateral part of the Brachi
Exam Question
  • Radial nerve is Derived from C5,6,7,8, T1
  • It is the branch of posterior cord of brachial plexus
  • It lies in spiral groove of humerus
  • The extensor compartment of arm & forearm is supplied by radial nerve
Don't Forget to Solve all the previous Year Question asked on RADIAL NERVE