Rotation is movement around the longitudinal axis and can be seen as head turning side to side. This occurs at which joints?

• A. Pivot joints
• B. Ball-and-socket joints
• C. Hinge joints
• D. Plane joints

Answer: (A)

Rotation around a single axis is a hallmark of pivot joints. The neck’s ability to turn the head from side to side comes from the atlas rotating around the odontoid process of the axis, a classic pivot joint arrangement. Because the movement is around one central axis, this type of joint fits best.

Ball-and-socket joints allow rotation in multiple directions and axes (like shoulder or hip), not limited to one axis. Hinge joints move mainly in one plane (flexion and extension) with little to no rotation. Plane joints provide sliding movements with limited rotation. So the described head-turning motion is most characteristic of pivot joints.