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joint (joint) the site of the junction or union of two or more bones of the body; its primary function is to provide motion and flexibility to the frame of the body. Fibrous joints are immovable; gliding joints have limited movement; and synovial joints have considerable movement.
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Various kinds of joints. Fibrous: A, syndesmosis (tibiofibular); B, suture (skull). Cartilaginous: C, symphysis (vertebral bodies); D, synchondrosis (first rib and sternum). Synovial: E, condyloid (wrist); F, gliding (radioulnar); G, hinge or ginglymus (elbow); H, ball and socket (hip); I, saddle (carpometacarpal of thumb); J, pivot (atlantoaxial).

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