In anatomical parlance, the forearm is the part of the body which extends from the elbow to the wrist and is not to be confused with the arm which extends from the shoulder to the elbow. The extensor muscles in the forearm are extensor carpi ulnaris, extensor digiti minimi, extensor digitorum, extensor indicis, extensor pollicis longus, extensor pollicis brevis, extensor carpi radialis brevis, extensor carpi radialis longus. These extensor muscles are supplied by the radial nerve. Other muscles in the forearm also innervated by the radial nerve are brachioradialis, supinator and abductor pollicis longus. Note that all these muscles are situated in the posterior half of the forearm (posterior when in the anatomical position).

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