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A joint is a meeting, or juncture, between two or more bones within the skeletal system. They are classified as synarthrotic, amphiarthrotic, or diarthrotic, based upon how much mobility they provide to that particular part of the body. A synarthrotic joint provides little or no movement, whatsoever. The suture lines in the skull would be a perfect example of a synarthrotic joint. When an infant is born, the skull is largeley cartilaginous, to facilitate the infants passing through the birth canal. The cartilage later turns to bones, the suture lines represent where the skull pieces came together. An amphiarthrotic joint is a joint that provides limited movement to that particular part of the body. A good example of that would be the joints in the backbone, between the individual vertebra of the backbone. And finally, the diarthrotic joints represent those with the greatest flexibility of movement. A good example of a diarthrotic joint would be the phalanges, fingers or toes, the hip, the elbow, the knee, and the shoulder.
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