Joints -
- 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.
- Such an arrangement allows considerable movement.
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Hence, the correct option is immovable
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