POSTERIOR INTERCOSTAL ARTERY - Gross Anatomy animations POSTERIOR INTERCOSTAL ARTERIES ------------------------------------------------------------- The intercostal spaces are supplied by pairs of anterior and posterior intercostal arteries. There are 11 pairs of intercostal arteries, Posterior Intercostal arteries supply greater part of the intercostal spaces. The first and second intercostal spaces are supplied by the superior intercostal artery by its branches, and the remaining nine are supp