Where are the atlas and the axis on the spinal column?

The atlas and axis are the first two vertebrae in the cervical region of the spinal column. The atlas (C1) sits directly beneath the skull and supports the head, allowing for nodding movements. The axis (C2) is positioned just below the atlas and features a unique peg-like structure called the odontoid process (or dens), which allows for rotational movement of the head. Together, they enable a wide range of motion in the neck.