Movable Joints

All other joints in the body are movable joints. These joints enable the body to perform a wide range of movements and activities. Movable joints include hinge, ball-and-socket, pivot, saddle, and gliding joints. An example of a hinge joint is found in the elbow, which allows you to move your forearm upward and downward, like a hinged door. An example of a ball-and-socket joint is the shoulder joint, which enables you to move your arm up, down, forward, and backward, as well as to rotate it in a complete circle. The joint formed by the top two vertebrae of your spine is an example of a pivot joint; it allows you to turn your head from side to side, as when shaking your head "no." The saddle joint, found at the base of each thumb, allows you to rotate your thumbs and helps you grasp objects with your hand. Finally, gliding joints allow bones to slide over one another. Examples are the joints between the small bones of your foot, which allow your foot to flex when you walk.

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