The correct option is 3: Pivot joint The joint present between the atlas (the first cervical vertebra, C1) and the axis (the second cervical vertebra, C2) is correctly classified as a Pivot joint, also known as a trochoid joint. This specialized synovial joint is uniquely structured to allow for the primary action of head rotation—the "no" movement. The axis (C2) possesses a distinctive upward bony projection called the odontoid process,…Read More