Joints, or articulations, exist wherever two bones meet. The function of each joint is closely related to its structure. Each joint reflects a workable compromise between the need for strength and the need for mobility. When movement is not required, joints can be very strong. For example, joints such as the sutures of the skull lock its separate elements together as if they were a single bone
At other joints, movement is more important than strength. At highly mobile joints, the interconnections between bones are looser and the joints weaker. For example, the shoulder joint permits a great variety of arm movements. The range of motion is limited more by the surrounding muscles than by joint structure. The joint itself is relatively weak, however, and shoulder injuries are rather common.
a. example and explanation
b. definition and explanation c. example and enumeration
a
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