WEBSpine Anatomy. The C1-C2 Vertebrae and Spinal Segment. By: Rob Dickerman, DO, PhD, FACOS, Neurosurgeon. Peer-Reviewed. The C1 and C2 vertebrae are the first two vertebrae at the top of the cervical spine. Together they form the atlantoaxial joint, which is a pivot joint. The C1 sits atop and rotates around C2 below.
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