Cross-section through upper third of forearm. A, Anconeus muscle; BR, brachioradialis; ECRB, extensor carpi radialis brevis; ECRL, extensor carpi radialis longus; ECU, extensor carpi ulnaris; EDC, extensor digitorum communis; EDQ, extensor digiti quinti; FCR, flexor carpi radialis; FCU, flexor carpi ulnaris; FDP, flexor digitorum profundus; FDS, flexor digitorum sublimis; FPL, flexor pollicis longus; PL, palmaris longus; PT, pronator teres; SUP, supinator.