Posterior limit is the right oblique fissure, which it meets at the level of the 6th rib in the midaxillary line.Runs horizontally from the hilum to the anterior and lateral surfaces of the right lung.Separates upper and middle lobes of the right lung.Above the hila, the lateral aspect is more posterior.Lateral aspect is anterior to the medial aspect at the level of the hila and below.Medial aspect passes through the hilum.Left major fissure is more vertically orientated.Extends from T4/T5 posteriorly to the diaphragm antero-inferiorly.Three to five primary lobules form a secondary lobule.Acinus with vessels, lymphatics and nerves form the primary lobule.One terminal bronchiole with lung tissue forms an acinus.Lingula of the upper lobe corresponds to right middle lobe.Lung Anatomy Ben Barnard Department of Radiology Kimberley Hospital
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