costodiaphragmatic recess
The costodiaphragmatic recess is the area inferior to the lung where the costal and diaphragmatic pleura are continuous. This is the lowest extent of the pleural cavity. The costomediastinal recess is a small anterior recess where the costal and mediastinal pleura are continuous. The cupola is the pleural space that extends above the first rib. The inferior mediastinum is a term sometimes used to refer to the anterior, middle, and posterior subdivisons of the mediastinum all together. The pulmonary ligament is a fold of pleura located beneath the root of the lung.