The cervical spine has seven vertebrae, or bones. RA inflammation typically affects C1, also called the atlas, and C2, also called the axis. C1 and C2 are the uppermost vertebrae and they have ...

The upper cervical spine, specifically, is the top vertebrae of the spine. It is made up of the atlas (C1) and the axis (C2). These vertebrae are atypical and are different in shape and function ...