Arteries and veins of the intercostal space (English)

The anterior and posterior intercostal arteries pass around the thoracic wall forming a basket-like pattern of vascular supply around it. These arteries mostly originate from the thoracic aorta and internal thoracic artery, respectively. Venous drainage generally parallels the pattern of arterial supply. The anterior intercostal veins drain into the internal thoracic vein, adjacent to the internal thoracic artery. Most of the posterior intercostal veins drain into the azygos venous system which is represented by the accessory hemiazygos vein at this level and left lateral perspective of the thoracic cavity. Collateral vessels are given off towards the lower edge of each intercostal space (superior border of rib below).