Final answer:
The radial nerve runs along the posterior aspect of the upper arm and forearm. It innervates the muscles in the posterior compartment of the forearm.
Step-by-step explanation:
The radial nerve runs along the posterior aspect of the upper arm and forearm. It innervates the muscles in the posterior compartment of the forearm, including the extensor radialis longus, extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, and extensor carpi ulnaris.