<Tr> <Th> FMA </Th> <Td> 12277 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> Synovial fluid, also called synovia, is a viscous, non-Newtonian fluid found in the cavities of synovial joints . With its egg white--like consistency, the principal role of synovial fluid is to reduce friction between the articular cartilage of synovial joints during movement . Synovial fluid is a small component of the transcellular fluid component of extracellular fluid . </P> <P> The inner membrane of synovial joints is called the synovial membrane and secretes synovial fluid into the joint cavity . Synovial fluid is an ultrafiltrate from plasma, and contains proteins derived from the blood plasma and proteins that are produced by cells within the joint tissues . The fluid contains hyaluronan secreted by fibroblast - like cells in the synovial membrane, lubricin (proteoglycan 4; PRG4) secreted by the surface chondrocytes of the articular cartilage and interstitial fluid filtered from the blood plasma . This fluid forms a thin layer (roughly 50 μm) at the surface of cartilage and also seeps into microcavities and irregularities in the articular cartilage surface, filling all empty space . The fluid in articular cartilage effectively serves as a synovial fluid reserve . During movement, the synovial fluid held in the cartilage is squeezed out mechanically to maintain a layer of fluid on the cartilage surface (so - called weeping lubrication). The functions of the synovial fluid include: </P>

Where is synovial fluid found in the body