What connective tissue encloses the joint cavity and retains synovial fluid?

What connective tissue encloses the joint cavity and retains synovial fluid?

• A. Joint capsule
• B. Bursa
• C. Ligament
• D. Tendon

Answer: (A)

Enclosing a synovial joint's cavity and keeping its lubricating fluid inside is the job of the joint capsule. It forms a tough outer fibrous layer plus an inner lining called the synovial membrane that seals the joint and holds the synovial fluid, which nourishes and lubricates the articular surfaces. A Bursa is a separate fluid-filled sac that reduces friction where muscles or tendons pass near bones; it doesn’t enclose the joint cavity. A ligament connects bone to bone to stabilize the joint, and a tendon attaches muscle to bone to enable movement. So, the structure that encloses the joint cavity and retains synovial fluid is the joint capsule.

Enclosing a synovial joint's cavity and keeping its lubricating fluid inside is the job of the joint capsule. It forms a tough outer fibrous layer plus an inner lining called the synovial membrane that seals the joint and holds the synovial fluid, which nourishes and lubricates the articular surfaces. A Bursa is a separate fluid-filled sac that reduces friction where muscles or tendons pass near bones; it doesn’t enclose the joint cavity. A ligament connects bone to bone to stabilize the joint, and a tendon attaches muscle to bone to enable movement. So, the structure that encloses the joint cavity and retains synovial fluid is the joint capsule.