Final answer:
Synovial joints have a fibrous capsule lined with a synovial membrane surrounding a joint cavity. The joint cavity is filled with synovial fluid, which lubricates the joint and reduces friction between the bones.
Step-by-step explanation:
Synovial joints have a fibrous capsule lined with a synovial membrane surrounding a joint cavity. The joint cavity is filled with synovial fluid, which lubricates the joint and reduces friction between the bones. The articular capsule, composed of connective tissue, allows movement of the joint while resisting dislocation.