Radial Nerve

Thursday, April 10, 2014

The radial nerve arises from the brachial plexus, precisely from the 6th, 7th, and 8th cervical roots. From its origin, it runs towards the arm, passing behind the axillary artery as it reaches the upper part of arm. It travels along the inner side of arm for half its length, then it goes diagonally over to the external side of arm, turning around and reaching its posterior part near the elbow, where it divides into two terminal branches: a superficial and a deep branch.

The radial nerve is a essentially a motor nerve which innervates the extensor carpis radialis longus, the tricep brachii, brachiradialis, anconeous muscles, extensor carpi radialis brevis, and supinator muscles.