Overview Lungs Extent of Lungs apex is located above the clavicle base rests on the diaphragm Right Lung 3 lobes upper (superior), middle, and lower (inferior) lobes 2 fissures oblique (major) fissure separates upper and lower lobes horizontal (transverse) fissure separates upper and middle lobes Left Lung 2 lobes upper (superior) and lower (inferior) lobes 1 fissure oblique fissure cardiac notch an indentation consequent to the deviation of apex of heart to left side login to view 4 more bullets Hilum of Lung a wedge-shaped area on mediastinal surface of each lung through which structures forming root of lung pass to enter or to exit lung Relationship of pulmonary artery (PA) to bronchus ("RALS") right lung: anterior to bronchus left lung: superior to bronchus Trachea bifurcates into left and right (primary) main bronchi at level of sternal angle right (primary) main bronchus is shorter, wider, and runs more vertically login to view 6 more bullets