The synovial membrane is the thin cell lining around the inside of lubricated joints.
Function of the synovial membrane
It is the synovial membrane that secretes the fluid that lubricates the joints.
Contribution of Infrapatellar Fat Pad and Synovial Membrane to Knee Osteoarthritis Pain. Belluzzi E et al. Biomed Res Int. 2019; 2019: 6390182.