1 — Second posterior intercostal artery; 2 — First rib [I]; 3 — Subclavian artery; 4 — Costocervical trunk; 5 — Supreme intercostal artery; 6 — Thyrocervical trunk; 7 — Deep cervical artery; 8 — Vertebral artery; 9 — Common carotid artery; 10 — Brachiocephalic trunk; 11 — First posterior intercostal artery; 12 — Internal thoracic artery; 13 — Sternal branches; 14 — Thoracic aorta; 15 — Posterior intercostal arteries; 16 — Dorsal branch; 17 — Lateral cutaneous branch; 18 — Collateral branch; 19 — Lateral mammary branches; 20 — Anterior intercostal arteries; 21 — Medial mammary branches; 22 — Perforating branches; 23 — Anterior radicular artery; 24 — Spinal branch; 25 — Posterior
radicular artery; 26 — Medial cutaneous branch