superior intercostal vein superior intercostal vein the superior intercostal veins are two veins that drain the 2nd, 3rd, and 4th intercostal spaces, one vein for each side of the body. superior intercostal veinintercostal spaces, viewed from the leftdetailssourceposterior intercostal veins #2, #3, and #4drains toazygos vein, brachiocephalic veinarteryintercostal arteriesidentifierslatinvena intercostalis superior dextra, vena intercostalis superior sinistrata98a12.3.04.024 a12.3.07.003ta24749, 4798fma4797anatomical terminology right superior intercostal vein the right superior intercostal vein drains the 2nd, 3rd, and 4th posterior intercostal veins on the right side of the body. it flows into the azygos vein. left superior intercostal vein the left superior intercostal vein drains the 2nd and 3rd posterior intercostal veins on the left side of the body. it usually drains into the left brachiocephalic vein. it may also communicate with the accessory hemiazygos vein. as it passes posteriorly above the aortic arch, it crosses deep to the phrenic nerve and the pericardiacophrenic vessels and then superficial to the vagus nerve.