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The lower region is accessed through a far-lateral approach and contains the craniocervical junction region constituted by the upper corridor in between the VII-VIII and IX cranial nerves (CNs), the median corridor between the X and XI CNs, and the lower corridor between the cranial and spinal rootlets of the XI CN. We propose a simple and concise systematization, dividing the area into three regions with predefined corridors. We propose a simple and concise systematization, dividing the area into three regions with predefined corridors.