Joints are points of contact between bones, or between bones and cartilages.
Force generated by the muscles is used to carry out movement through joints, where the joint acts as a fulcrum.
According to the mobility they are classified under the following heads:
Fibrous or Immovable Joints:
Fibrous joints do not allow any movement.
This type of joint is shown by the flat skull bones which fuse end-to-end with the help of dense fibrous connective tissues in the form of sutures, to form the cranium.
Cartilaginous or Slightly Movable Joints:
The bones involved are joined together with the help of cartilages.
The joint between the adjacent vertebrae in the vertebral column is of this pattern and it permits limited movements.
Synovial or Freely Movable Joints:
Synovial joints are characterised by the presence of a fluid-filled synovial cavity between the articulating surfaces of the two bones.