Which statement best describes the joint capsule's role?

Which statement best describes the joint capsule's role?

• A. It encloses the joint and provides a sealed environment for synovial fluid.
• B. It strengthens tendons around the joint.
• C. It contains bone marrow for hematopoiesis.
• D. It consists of cartilage to reduce friction.

Answer: (A)

The joint capsule serves as the protective enclosure around a synovial joint, creating a sealed space that contains synovial fluid. This fluid lubricates the joint so the bony ends glide smoothly and nutrients reach the avascular cartilage. The outer fibrous layer adds stability by anchoring to surrounding ligaments and tissues, while the inner synovial membrane produces the fluid. So, the capsule encloses the joint and maintains a sealed, lubricated environment for movement. It doesn’t strengthen tendons around the joint—that role belongs to tendons and ligaments—nor does it house bone marrow or consist of cartilage.

The joint capsule serves as the protective enclosure around a synovial joint, creating a sealed space that contains synovial fluid. This fluid lubricates the joint so the bony ends glide smoothly and nutrients reach the avascular cartilage. The outer fibrous layer adds stability by anchoring to surrounding ligaments and tissues, while the inner synovial membrane produces the fluid. So, the capsule encloses the joint and maintains a sealed, lubricated environment for movement. It doesn’t strengthen tendons around the joint—that role belongs to tendons and ligaments—nor does it house bone marrow or consist of cartilage.