I — Tendinous sheath of extensor digitorum and extensor indicis; 2 — Dorsal interossei; 3 — Extensor indicis; 4 — Ulna; 5 — Flexor digitorum profundus; 6 — Flexor carpi ulnaris; 7 — Anconeus; 8 — Subcutaneous olecranon bursa; 9 — Articularis cubiti; 10 — Humerus;
II — Intratendinous olecranon bursa; 12 — Lateral epicondyle; 13 — Supinator; 14 — Extensor carpi radialis longus; 15 — Extensor carpi radialis brevis; 16 — Abductor pollicis longus; 17 — Extensor pollicis brevis; 18 — Extensor pollicis longus; 19 — Extensor retinaculum;
20 — Dorsal interosseus [I]
