What is the name of the first cervical vertebrae?

The first cervical vertebra, known as the atlas, plays a crucial role in supporting the skull and facilitating the motion of the head. It is uniquely structured to allow for the nodding motion of the head, which is essential for movements such as looking up and down. The atlas is characterized by its ring-like structure, lacking a vertebral body, which sets it apart from other vertebrae in the cervical region.

This vertebra articulates with the occipital bone of the skull, creating the atlanto-occipital joint, which is responsible for the majority of the head's forward and backward movement. Its anatomical design is specifically adapted to accommodate the weight of the head while allowing for a significant range of motion. This distinct function is what makes the atlas an essential component of the cervical spine and overall cervical anatomy.