Which of the following options correctly identifies the location of a pivot joint?
The hip and shoulder joint
Between the atlas and the odontoid process of the axis
Sternoclavicular joint
Temporomandibular joint
A pivot joint is a type of synovial joint that allows rotational movement. It occurs specifically between the first (atlas) and second (axis) cervical vertebrae in the neck. The atlas is the topmost vertebra that connects to the skull while the axis lies just below the atlas. The odontoid process is a bony projection on the axis that acts as a pivot point. The pivot joint formed between the atlas and the odontoid process allows for the rotation of the head from side to side, as in shaking the head to indicate "no." This joint enables the important function of head rotation and is an example of a pivot joint in the human body. Hence, the correct answer is option 2.