Superjacent

The visceral pleura, adheres closely to the subjacent alveoli of the lung.

Under

Below

Underneath

Supporting

Subordinate

Secondary

Downhill

Lesser

Subsidiary

Subjacent

Inferior

Earthward

Sagging

Junior

Diminished

Lower

Sunken

Paracrine glands are similar to endocrine glands but instead of secreting material into the bloodstream or into their ducts, their products act on the target cells by diffusion of their material into the extracelular space or in the immediately subjacent connective tissue.

You have the potential space between the parietal and visceral (outer and inner) pleura. If air happens to enter this space, the lung will collapse to small ball. The space becomes large at once. You have negative pressure in this space.