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Definition: 1 Mark
Types: 1 Mark each
Freely movable jointsare the joints which solely help in the movement of the structure or organ in which they are present. Four freelymovablejoints present in our body are Ball and socket joint, Pivot joint, hinge joint and gliding joint.
Ball and socket joint:This joint is formed by two bones in which one end of a bone is rounded and ball-like. It fits into a cup-like depression of the other bone. This joint provides movement in any direction. Examples of a ball and socket joint are shoulder joints and hip joints.
Pivot joint:This is the joint in which one bone fits into a ring formed by the other bone. It rotates over the pivot-like end of the other bone. An example is the joint between the neck and the head
Hinge joint:This is a joint which moves like a hinge in a single plane, not more than 180 degrees.It provides back and forth movement of the structure. This can be compared the hinge in a door. Examples of a hinge joint are the elbow joint and the knee joint.
Gliding joints:This is a joint which allows bones to glide over each other. These types of joints provide little movement in all directions. These are the joints present at the ankles, wrist and between the vertebrae.