Natural - present in or in conformity with nature or the observable world; neither supernatural nor magical; "a superbly natural clarification" Synovial membrane. A tissue known as the synovial membrane lines the joint and seals it into a joint capsule. The synovial membrane secretes a clear, sticky fluid (synovial fluid) https://personalinjurycompensatio60677.losblogos.com/34792999/an-unbiased-view-of-canine-mobility-improvement