The framework of our body is made up of bones, which are hard and rigid. A joint is an articulation between the two bones.
Joints can be freely movable, partially movable or immovable.
Freely movable joints facilitate free movements between two bones. These joints are also called synovial joints. These joints have a space in between, which is known as synovial cavity, filled with a viscous, slippery synovial fluid.
Examples of freely movable joints are ball and socket joint, hinge joint, pivot joint and gliding joint.
Ball and socket joint enables the bones to move in a 360° angle and is present between humerus and pectoral girdle.
Elbow joint is a hinge joint.
Pivot joint moves by rotation and is present between first and second vertebra.
Gliding joint is present between radius–ulna and carpals.A gliding joint allows linear, angular and circular motion.
Partially movable joints allow only slight or very little movement between two bones.These joints allow only slight bending and mild rotation.Example of partially movable joints include joint between a rib and breast bone.
No movement is allowed in between immovable joints. Example of immovable joints include joints between upperjaw and rest of skull.
To Access the full content, Please Purchase
Joints are necessary for taking up the process ofMarks:1
Joints are points where two body parts join. They are necessary for the movement because bones are hard and cannot be bent.
Ball and socket joints can moveMarks:1
in all directions.
Ball and socket joints are present in our shoulders. They are the joints that can move in all directions and that is the reason we can rotate our arms.
Ball and socket joints are present in theMarks:1
joint between the shoulder and arm.
The end of arm is like a ball and the shoulder is like a socket into which the arm fits in. This allows free movement of the arm as it can easily rotate while being fitted in the socket. Such a joint is also present in the joint between legs and hips. So, we can easily rotate our legs during walking.
The joint, where one bone fits into the half cavity of the other bone, is known asMarks:1
Bones of hinge joint can only move back and forth like a door, e.g., elbow and knee.
The joint in the skull is aMarks:1
The unmovable zipper-like joint of skull is an example of fixed joint.