1 — Intercostal nerve [IX], anterior cutaneous branch; 2 — Internal intercostal muscle; 3 — Serratus anterior; 4 — Innermost intercostal muscle; 5 — External intercostal muscle; 6 — Pectoralis minor; 7 — Pectoralis major; 8 — Second [II] rib; 9 — Sternal angle; 10 — Internal thoracic artery; Internal thoracic veins; 11 — Intercostal nerve; 12 — Intercostal artery, vein and nerve; 13 — Rectus abdominis; 14 — Linea alba
