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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.
In general, the spinal nerves emerge below the pedicle of the vertebra for which they are named. For example, spinal nerve T3 exits through the intervertebral foramen between the 3rd and 4th thoracic vertebrae. In the cervical region, this rule does not apply.While the cervical region of the spine has 7 vertebrae, there are 8 cervical spinal nerves. Spinal nerve C1 exits above vertebra C1, spinal nerve C2 exits through the intervertebral foramen between the 1st and 2nd cervical vertebrae, etc.or example, spinal nerve T3 exits through the intervertebral foramen between the 3rd and 4th thoracic vertebrae. In the cervical region, this rule does not apply. While the cervical region of the spine has 7 vertebrae, there are 8 cervical spinal nerves.