What is an example of a pivot joint?

A pivot joint is a type of synovial joint that allows for rotational movement around a single axis. In the human body, the neck illustrates this concept with the connection of the first and second cervical vertebrae (the atlas and axis). This joint structure allows for the head to rotate from side to side, enabling actions such as shaking the head "no."

In contrast, the other joints mentioned serve different functions. The elbow is classified as a hinge joint, permitting movement primarily in one direction (flexion and extension). The wrist is a complex joint that mixes multiple types of movements and does not fit the specific criteria for a pivot joint. Lastly, the hip is a ball-and-socket joint, which allows for a greater range of motion in various directions rather than simple rotation around a single axis. Thus, the neck is the correct example of a pivot joint due to its unique ability to facilitate rotational movements.