In the pleural cavity, the<unk>  is a potential space at the posteriormost tips of the cavity, located at the junction of the costal pleura and diaphragmatic pleura.
The lungs expand into this recess during forced inspiration.
Costodiaphragmatic recess
Costomediastinal recess
Sternocostal surface
Subcostal plane
Mediastinal pleura
Sternal plane
Right border of heart
Left margin of heart