Explanation:

First of all

Synovial joints contain the following structures:

Synovial cavity: all diarthroses have the characteristic space between the bones that is filled with synovial fluid

JOINT capsule: the fibrous capsule, CONTINUOUS with the periosteum of articulating bones, surrounds the diarthrosis and unites the articulating bones; the joint capsule consists of two layers - (1) the outer fibrous membrane that may contain ligaments and (2) the inner synovial membrane that secretes the lubricating, shock absorbing, and joint-nourishing synovial fluid; the joint capsule is highly innervated, but without blood and lymph vessels, and receives nutrition from the surrounding blood supply via either diffusion (a slow process) or by convection, a far more efficient process achieved through exercise.

Articular cartilage: the bones of a synovial joint are covered by this layer of hyaline cartilage that lines the epiphyses of joint end of bone with a smooth, slippery surface that does not bind them TOGETHER; articular cartilage functions to ABSORB shock and reduce friction during movement.

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