Internal Thoracic Artery, Anterior View

Description

Running vertically along the parasternal line, the internal thoracic artery descends from the first part of the subclavian artery deep to the anterior thoracic wall, immediately posterior to the costal cartilages and anterior to the pleura. Anterior musculature frames the field, with pectoralis major superficial to the ribs and costal cartilages, deltoid capping the lateral shoulder, and biceps brachii visible in the anterior arm. Segmental anterior intercostal branches course laterally within the intercostal spaces, while paired venous channels track alongside the artery toward the brachiocephalic veins. Orientation stays anterior and slightly oblique, so left-right relationships across the sternum remain clear. For coronary revascularization, the internal thoracic artery is the workhorse conduit, and this perspective reinforces why surgeons respect its course behind the first six costal cartilages and adjacent to the sternum during median sternotomy and parasternal dissection. Injury or spasm here is not theoretical. The same anatomy underlies the risk of sternal wound complications when one or both internal thoracic arteries are harvested, and it also explains why anterior intercostal supply can be compromised after sternotomy. Its proximal origin from the subclavian artery is a key landmark when teaching collateral flow in subclavian stenosis and when interpreting catheter angiography. Medical educators will find this asset suited to thoracic wall lectures in gross anatomy, vascular anatomy modules, and cardiothoracic surgery teaching on internal mammary artery harvest and graft routing to the left anterior descending artery. It also supports figure development for textbooks and journals covering chest wall perfusion, sternotomy technique, or intercostal vascular patterns, and it works well in patient-facing materials explaining CABG conduit choices. Anatomical accuracy verified by SciePro's Medical Advisory Board.