Interstitial space between cells, occupied by INTERSTITIAL FLUID as well as amorphous and fibrous substances. For organisms with a CELL WALL, the extracellular space includes everything outside of the CELL MEMBRANE including the PERIPLASM and the cell wall.

Synonyms: Intercellular Space, Space, Intercellular, Spaces, Intercellular, Extracellular Spaces, Spaces, Extracellular, Extracellular Space, Intercellular Spaces, Space, Extracellular