The framework of the body, consisting of bones and other connective tissues, which protects and supports the body tissues and internal organs is called as the skeletal system.
The human skeleton contains 206 bones of various shapes, sizes, and functions.
A joint is the connection between two bones. The skeletal system is made of four different types of joints.
1) Hinged Joint
Hinged joints include the elbow, fingers, toes and knee.
Movement occurs in only one direction or one plane.
2) Ball and Socket Joint
A ball and socket joint is a rounded surface of a bone that fits into and moves withing a cup shaped depression.
It allows freedom of movement up, down, right, left and in a full 360-degree rotation.Examples : Hip and shoulder joints.
3) Gliding Joint
Gliding joints allows flat or slightly rounded bones to move easily together without friction.
This joint allows motions such as bending, stretching and circular motion. Examples : Forearm to wrist joint and lower leg to ankle joint.
4) Pivot Joint
A pivot joint is designed with one end fitting like a cylinder inside a ring. Pivot joints at the base of the skull allow the head to rotate. Other pivot points allow the rotation of the palm.
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