The two main intracellular fluid (ICF) compartments are the interstitial fluid contained in the nucleus and the intravascular fluid contained in the cell body.

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Two thirds of the body's water is ICF and one third is in the extracellular fluid (ECF) compartments. The two main ECF compartments are the interstitial fluid and the intravascular fluid, which is the blood plasma. Other ECF compartments include the lymph and the transcellular fluids, such as the synovial, intestinal, biliary, hepatic, pancreatic, and cerebrospinal fluids; sweat; urine; and pleural, synovial, peritoneal, pericardial, and intraocular fluids.

The Two Main Intracellular Fluid (ICF) Compartments Are the Interstitial