Structure and function of joints

A joint is the area where two or more bones meet.
Examples are the knee, elbow, shoulder, and ankle.
A joint is made up of two or more bones, ligament, synovial membrane, synovial cavity, synovial fluid, and articular cartilage. A ligament connects bones to another bones.
The synovial membrane lines the inner surface of joint cavity.
A joint cavity is the space that encapsulated by a synovial membrane and filled with synovial fluid.
Articular cartilage covers the ends of the bones within a joint.