Anterior intercostal branches of internal thoracic artery Tags: Anatomical Structure, Artery.The Anterior intercostal branches of internal thoracic artery supply the upper five or six intercostal spaces. The internal thoracic artery then divides into the superior epigastric artery and musculophrenic artery. thumbnail branch from Internal thoracic artery Dorlands prefix r_02 Dorlands suffix 12690359 Gray page 584 Gray subject 148 vein Anterior intercostal veins Learn more... Loading...