X-ray can be defined as a form of electromagnetic radiation that passes through your body to expose a piece of film that forms an image of your body. A neck X-ray also known as cervical spine X-ray is an imaging test to look at cervical vertebrae. There are 7 bones of the spine in the neck that surround and protect the top section of your spinal cord. The Bones appear white on X-rays because very less radiation can pass through them to expose the film on the other side.