Muscles of the lower armOnline version Muscles of the lower arm by Donna Goodwin 1 Brachialis 2 Pronator teres 3 Flexor carpi radialis 4 Palmaris longus 5 Flexor carpi Ulnaris 6 Flexor digitorum sublimis 7 Palmar interosseus 8 Brachioradialis 9 Flexor pollicis brevis 10 Opponens pollicis