Final answer:
A pivot joint is a uniaxial joint that permits rotational movement around a single axis, exemplified by the atlantoaxial joint between the C1 and C2 vertebrae, which enables head rotation.
Step-by-step explanation:
The student is asking about a type of joint in the human body known as a pivot joint, which is a uniaxial joint. These joints allow for rotational movement around a single axis. An example of a pivot joint is the atlantoaxial joint located between the first two cervical vertebrae, the atlas (C1) and axis (C2).
This specific joint enables the head to rotate side to side as when shaking the head in a "no" gesture. Another example is the proximal radioulnar joint, which allows for the rotation of the radius bone around its length, facilitating pronation and supination movements of the forearm.
An example of a pivot joint is the atlantoaxial joint between the C1 and C2 vertebrae in the spine, which allows the head to rotate from side to side.