The first two cervical vertebrae are the atlas (C1) and the axis (C2.)
The atlas is named for the character from Greek Mythology who supported the globe, though in anatomy, the head is the globe. In fact, the articular facets of the atlas align perfectly with the occipital condyles on the skull.
The axis has a protrusion called the odontoid process, also called the “dens” after its shape that resembles a tooth. The dens articulates with the atlas and creates a pivot join which allows the head to turn left and right.