Pulmonary veins Bronchiole Visceral pleura Interlobular septum Pulmonary artery Lymphatics Fig.1.-Line drawing ot a secondary pulmorary lobule.Borders of lobule are interlobular septa.At center of each lcbule isa bronchiole and a pulmonary artery (b).Pulmonary vein (red)run in interlobular septa.Lymphatics (green are found in interlobular septa and in central or axial interstitium that surrounds bronchovascular bundles