Deep Branch of Radial Nerve  

• * Enters the supinator muscle, winds laterally around the radius, and supplies the extensor carpi radialis brevis and supinator muscles.
• * Emerges from the supinator as the posterior interosseous nerve and innervates the extensor muscles of the forearm..                                            

Superficial Branch:

• * Descends in the forearm under cover of the brachioradialis muscle and then passes dorsally around the radius.
• * Runs distally to the dorsum of the hand to innervate the skin of the radial side of the hand and the radial two and one-half digits over the proximal phalanx. This nerve does not supply the skin of the distal phalanges.                                                                                                                                                                                 

Muscular Branches:

• * Supply the brachioradialis and extensor carpi radialis longus.

Posterior Brachial Cutaneous Nerve:

• * It is a branch of the radial nerve given off in the axilla. Its root value is C5.
• * Supplies the skin of the back of the arm from the insertion of the deltoid to the olecranon process.

Posterior Antebrachial Cutaneous Nerve​​​​​​​:

• * It arises from the radial nerve in the radial groove.
• * Descends posterior to the lateral epicondyle and supplies the skin of the back of the forearm.