This document provides an anatomical diagram of the posterior forearm and lists the muscles of the superficial and deep forearm extensors. Key muscles identified include the extensor carpi radialis longus and brevis, brachioradialis, supinator, anconeus, extensor pollicis longus and brevis, and extensor indicis proprius. The diagram orients the reader to the anterior, medial, lateral, and posterior aspects of the forearm as well as superficial and deep muscle layers.