Fig. 4

Post-contrast transverse computed tomographic images of the caudal lung lobes in a rabbit. a The branches of the pulmonary artery (a) and vein (v) are seen lateral and medial, respectively, and in close relationship to the corresponding principal bronchi (arrow). b In contrast, the caudal lobar vessels are running parallel but with a certain distance to the lobar bronchi. The cross-sectional area of the bronchial tree is constantly smaller than the accompanying vessels throughout the lungs