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Joint: The area where two bones are attached for the purpose of permitting body parts to move. A joint is usually formed of fibrous rel=dict connective tissue and cartilage. Joints are grouped according to their type of motion: rel=dict ball-and-socket joint hinge joint condyloid joint, which permits all forms of angular movement except axial rotation pivot joint gliding joint or saddle joint. Joints can move in only four ways: gliding, in which one bony surface glides on another, without angular or rotatory movement angular, a movement that occurs only between long bones, increasing or decreasing the angle between the bones circumduction, which occurs in joints composed of the head of a bone and an articular cavity, with the long bone describing a series of circles and the whole forming a cone and rotation, in which a bone moves about a central axis without moving from this axis. Also known as articulation and rel=dict arthrosis.