1. The Movable Joints
Bones are held together at the joint by
a strong, fibrous tissues called
ligaments. These are usually attached
above and below the joint.

4. There are also protective structures
among movable joints. An elastic and
smooth layer called cartilage protects
movable joints from wear and tear in
several ways. A smooth layer of cartilage
(gristle) covers the ends of bones that
move over one another.

6. The elasticity of cartilage breaks the
force of sudden shocks. The smooth
quality of the cartilage makes a joint
move easily. A liquid called synovial fluid
keeps the joints moist and lubricated.