The vertebrae at the top of the neck tend to be smaller and more mobile while the lower cervical vertebrae are larger to handle greater loads from the neck and head above. C3, C4, C5, and C6 cervical vertebrae.
The neck is connected to the upper back through a series of seven vertebral segments. The cervical spine has 7 stacked bones called vertebrae, labeled C1 through C7. The top of the cervical spine connects to the skull, and the bottom connects to the upper back at about shoulder level.
A fracture (break or crack) in one of the seven cervical vertebrae in your neck that support your head and connect it to the shoulders and body is called a cervical fracture or sometimes, a broken neck. A broken neck is a big deal because it is the central nervous system’s main, some may say only, connection between the brain and the body.