THE CRANIOCERVICAL JUNCTION (CCJ) OR THE CRANIOVERTEBRAL JUNCTION (CVJ)
The cervical spine (neck) has seven different numbered spinal levels from C1 to C7.
The craniocervical junction (CCJ) is the anatomic region located at the transition from the base of the skull to the upper cervical spine. In simple words, this is where the base of your brain becomes part of your spinal column.