The lung lobes are further divided into smaller units, which are called the pulmonary segments. There are 10 segments available in the right lung and, based on the classification, 8 - 10 segments in the left lung. The pulmonary segments are not delimited, unlike the lobes from each other by fissures. But, by thin membranes of the connective tissue containing lymphatics and veins, the arterial supply follows the segmental bronchi.