There are three types of joints - synovial, fibrous and cartilaginous. Synovial joints have a synovial cavity, articular cartilage, synovial membrane and ligaments.
The synovial cavity is formed around the two ends of the intersecting bones. The cavity is filled with synovial fluid, which lubricates the joint. Articular cartilage is the smooth layer of cartilage which covers the ends of the two bones and provides a smooth surface which the bones glide against as they move about the joint. The synovial membrane surrounds the synovial cavity, forming a space which holds the synovial fluid around the joint. Ligaments are pieces of tough connective tissue that holds the bones together at the joint.
Fibrous and cartilaginous joints are different classes of joints. Cartilaginous joints are joined by cartilage and allow very little movement. Fibrous joints are joined by fibrous connective tissues and allow no movement.
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