Synovial membrane

The synovial membrane is a soft tissue that lines the inner surfaces of joints, where bones meet. Its primary function is to produce synovial fluid, a thick, slippery liquid that lubricates the joint, reducing friction and allowing smooth movement. Besides lubrication, the membrane also supplies nutrients to the cartilage covering the ends of bones within the joint. It is flexible and contains blood vessels and nerves, helping maintain healthy joint function. When inflamed, as in conditions like arthritis, the synovial membrane can become swollen, causing pain and stiffness.