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The two upper vertebrae of the cervical spine are called the atlas and the axis. They differ from the other vertebrae because they are designed specifically for rotation. These two vertebrae are the reason your neck and head can move in so many directions. The atlas is the first cervical vertebra--the one that sits between the skull and the rest of the spine. The atlas does not have a vertebral body, but it does have a thick forward (anterior) arch and a thin back (posterior) arch with two prominent sideways masses. The atlas sits on top of the second cervical vertebra, the axis. The axis has a bony knob called the odontoid process, which sticks up through the hole in the atlas. It is this special arrangement that allows the head to turn from side to side as far as it can.
The cervical spine has seven vertebral bodies (segments). The top two segments are unique: 1  The first cervical segment (called the atlas) is a ring that does not have a vertebral body. 2  It is attached to the second vertebral body (the axis), which acts as a post that the first vertebral ring rotates around. 3  Most of the rotation in the neck is located in these top two segments.