Answer:
The spinal cord consists of 5 divisions or regions of vertebrae, in the cervical region (the most "superior" segment) along the spinal cord, are the 'typical' and 'atypical' vertebrae. Altogether this region has 7 vertebrae, named from the most superior to inferior positioned (C1-C7) i.e. from top to bottom.
The 'atypical' vertebrae are the two most superior positioned i.e. the top two (C1 & C2); C1 is also called the 'Atlas' and C2 the 'Axis'. The 'typical' vertebrae are the five most inferior positioned i.e. the bottom 5 (C3-C7).