What is the primary function of the synovial membrane?

• A. Provide nutrients to bone
• B. Form the outer capsule
• C. Produce synovial fluid
• D. Store calcium

Answer: (C)

The synovial membrane’s primary function is to produce synovial fluid that lubricates the joint and nourishes the articular cartilage. It lines the inner surface of the joint capsule and contains synoviocytes that secrete the fluid. This lubrication reduces friction during movement and provides nutrients to the avascular cartilage, helping maintain joint health. It doesn’t form the outer capsule—that’s the fibrous capsule—and it doesn’t store calcium, which is a bone function.