I — External intercostal membrane; 2 — External intercostal muscle; 3 — Internal intercostal muscle; 4 — First rib [I]; 5 — Manubrium of sternum; 6 — Body of sternum; 7 — Xiphoid process; 8 — Costal cartilage; 9 — Innermost intercostal muscle; 10 — Supreme intercostal vein;
II — Supreme intercostal artery; 12 — Intercostal nerves, anterior rami; ventral rami; 13 — Collateral branch; 13 — Parietal pleura; 14 — Pari-
etal pleura; 15 — Endothoracic fascia; Parietal fascia of thorax; 16 — Costal groove
