contains the heart and the pericardium, ascending and transverse arch of the aorta, SVC, azygos, brachiocephalic vein and arteries and phrenic nerves upper vagus nerves, trachea and its bifurcation, the main bronchi, pulmo artery and branches, pulmo veins, lymph nodes
Surface projections of the lungs and the pleural cavities
The apex of each lung projects above the medial third of the clavicle.
The oblique fissure begins posteriorly in the upper thoracic region, crosses the 5th and 6th ribs, curves laterally to the midaxillary line, and courses along the lower border of the 6 th rib to the lateral border of the sternum.
The right lung's horizontal fissure courses along the lower border of the 4th rib from the midaxillary line to the lateral border of the sternum