Now we know that fascia is a very heterogenous and “active” tissue, unlike the widespread 20th-century characterization as a relatively undifferentiated and passive part of the body. Thus, researchers do not yet have a unanimous definition.
The anatomical and physiological knowledge and understandings of fascia has increased with evolving research technologies over the last decades and is likely to continue to change. 
Fascia is now being more expansively described in a multiple-discipline-spanning way and is depicted as a complex, global connective tissue system, critical for body function and health.