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Bones are too rigid to bend without damage. Fortunately, there are multiple bones throughout the body joined together by joints (the articulation or union between two or more bones or parts of bones). This segmentation of the skeleton allows for movement and segmental growth. As is the case with all aspects of the musculoskeletal system, the structure of a joint, specifically the manner in which the joints are held together, determines its function. Although there are many ways to classify joints, the simplest is a functional classification of little to no movement (synarthroses, syndesmoses, and synchondroses) versus freely movable (diarthroses) (Table 3.7).