The synovial membrane, also known as synovium, is a specialized connective tissue that lines the cavities of synovial joints, such as the knees, elbows, and hips. Its primary function is to produce synovial fluid, a viscous fluid that lubricates the joint, reduces friction between the articular cartilages of the bones, and nourishes the cartilage.
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The synovial membrane lines the internal non-cartilaginous surfaces of a synovial joint capsule. It contributes to production and regulation of synovial fluid. It does not simply extend as the same lining over the load-bearing articular cartilage.