Define transcellular fluid compartment - extracellular fluid?

The transcellular fluid is a small compartment that represents all those body fluids which are formed from the transport activities of cell. These do not readily exchange water with the bulk of the extracellular compartment and includes cerebrospinal fluid and secretions of the gastrointestinal tract.

The fluids in the eyeball (vitreous humor), around joints (synovial fluid), and within the digestive tract, as well as, a few specialized fluids are outside the cells and thus are extracellular, but do not readily exchange water with the bulk of the extracellular compartment. These fluids are called transcellular fluid compartment.