The atlantoaxial joint is a pivotal joint located between the first cervical vertebra, known as the atlas, and the second cervical vertebra, called the axis. This joint allows for a significant range of motion, particularly rotation of the head. It plays a crucial role in enabling the head to turn from side to side. The atlantoaxial joint is classified as a synovial joint, which means it is surrounded by a capsule filled with synovial fluid that lubricates the joint. This joint is essential for neck mobility and stability, making it vital for everyday activities such as looking around and nodding.