Types of joints
plane joint
The Plane Joint is mostly found in the palm of the hand. It is like two discs together and start rubbing them together.
saddle jointThe Saddle Joint is mostly found in the thumb. It is the reason that the human thumb is opposable. Think of it like a saddle on a horse.
pivot jointThe Pivot Joint is like two DVD's with a stick through it. It is found all up the spine.
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hinge jointThe Hinge Joint is mostly found in the elbow. It is the reason that the elbow can move only up and down. Think of it like a door on a hinge.
ball-and-socket jointThe Ball-and-Socket Joint is mostly found in the hip and is like a ball in a very tight bowl that can still move.
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ELLIPSOID JOINT
The Ellipsoid Joint is found in the wrist. It is like a long bowl with the mould of it in it.