The synovial membrane is a specialized tissue that lines the inner surface of synovial joints, such as the knee and elbow. It produces synovial fluid, which lubricates the joint, reducing friction during movement and providing nourishment to the cartilage. This membrane is composed of a layer of connective tissue and cells called synoviocytes. The synovial fluid it secretes also helps to absorb shock and distribute nutrients, playing a crucial role in maintaining joint health and function.