The<unk><unk>  of the lung is thin and sharp where it separates the base from the costal surface and extends into the phrenicocostal sinus; medially where it divides the base from the mediastinal surface it is blunt and rounded.
Inferior border of lung
Hilum of lung
Mediastinal pleura
Mediastinal surface of lung
Horizontal fissure of right lung
Costomediastinal recess
Subcostal plane
Floating rib