1 — Intertendinous connections; 2 — Extensor digitorum; Tendon; 3 — Extensor retinaculum; 4 — Extensor carpi radialis brevis; 5 — Extensor digitorum; 6 — Anconeus; 7 — Lateral intermuscular septum of arm; 8 — Triceps brachii; 9 — Biceps brachii; 10 — Brachialis; 11 — Brachioradialis; 12 — Extensor carpi radialis longus; 13 — Abductor pollicis longus; 14 — Extensor pollicis brevis; 15 — Extensor pollicis longus;
16 — Dorsal interossei
