In this illustration the lower lobe arteries are coloured blue because they contain oxygen-poor blood. They have a more vertical orientation, while the pulmonary veins run more horizontally towards the left atrium, which is located below the level of the main pulmonary arteries. #Anatomy #Radiology #CXR #Lateral #LeftAtrium #PulmonaryArteries #PulmonaryVeins #RadiologyAssistant
