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pivot joint
Pivot joint (trochoi joint, rotary joint): Where the movement is limited to rotation, the joint is formed by a pivot-like process turning within a ring, or a ring on a pivot, the ring being formed partly of bone, partly of ligament.
Trivia about pivot joint
(Sarah of the Clue Crew shows an anatomical animation on the monitor.) The joint in your neck that allows you to move your head from side to side is classified as this type, which rotates around a central axis