The cervical spine consists of the seven vertebrae that make up the spinal segments of the neck.

The first cervical segment is a ring of cartilage that does not have a vertebral body. It is attached to the second vertebral body, which acts as a post that the first vertebral ring rotates around. Most of the rotation in the neck is located in these top two segments.
The next five cervical vertebral segments have three joints at each segment, including one disc in the front and a dually faceted of joints in the back.
 

Computer Assisted Tomography(CAT Scan), commonly known as a CT scan takes cross section images of the body.  They are used to detect fractures, lesions and infections in the spine.

A CT scan works by encasing the body with a x-ray.  A computer is used to reformat the image into cross-sections of the spine that are repeated at multiple different intervals. As a result, the spinal canal can be imaged and assessed for specific conditions.

When combined with a myelogram, which is an injection of radioactive dye, a CT scan can reveal how the bone is affecting nerves. This is a very sensitive test that can pick up subtle lesions and fractures.

CT scans should not be performed on women who may be pregnant.