Synovial tissues

Definition of synovial membrane
National Cancer Institute

synovial membrane

(sih-NOH-vee-ul MEM-brayn)
A layer of connective tissue that lines the cavities of joints, tendon sheaths, and bursae (fluid-filled sacs between tendons and bones). The synovial membrane makes synovial fluid, which has a lubricating function.

Source: NCI Dictionary of Cancer Terms