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The craniocervical junction (CCJ) is an anatomically complex region and essential for cervical mobility. It contributes to about 50% of the range of motion (ROM) of the cervical spine. The occiput-C1-C2 apparatus not only conducts and protects the vertebral artery as it transitions from the transverse foramina to the point where it penetrates the dura and subarachnoid space, it is also a platform...