Radial nerve

Radial nerve is the largest branch of the brachial plexus (C5 to T1) and it carries both sensory and motor neurons fibers.

ORIGIN
The nerve has an origin in each one of the plexus nerve roots but arises mainly from the posterior cord and divides into two terminal branches, designated superficial and deep, that supply muscular and cutaneous branches to the posterior aspect of the arm and forearm.

COURSE
After leaving the posterior cord of the brachial plexus it goes through the arm, first in the posterior compartment of the arm, and later in the anterior compartment, and continues in the posterior compartment of the forearm. The nerve ends in the dorsal part of the hand as a sensory nerve.

INNERVATION
Talking about the muscular supply it innervates triceps brachii, supinator, anconeus, the extensor muscles of the forearm, and brachioradialis; about the cutaneous supply it innervates skin of the posterior arm as the dorsal cutaneous nerve of the arm, and also in the posterior region of the hand.