Extracellular Space

**Definition:** 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.

**Tree numbers:** - A10.082.500 - A11.284.295

**Synonyms:** - Intercellular Space