Synovial fluid | 合法醫療器材資訊網

Fluid found in the cavities of synovial joints

Synovial fluid, also called synovia,[help 1] is a viscous, non-Newtonian fluid found in the cavities of synovial joints. With its egg white–like consistency,[1] the principal role of synovial fluid is to reduce friction between the articular cartilage of synovial joints during movement.[2] Synovial fluid is a small component of the transcellular fluid component of extracellular fluid.

The inner membrane of synovial joints is called the synovial membrane and secretes synovial fluid into the joint cavity.[3] 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.[4] The fluid contains hyaluronan secreted by fibroblast-like cells in the synovial membrane, lubricin (proteoglycan 4; PRG4) secreted by the surf...