Translations:Hirnnerven/1/en

There are a total of 12 pairs of cranial nerves. These are nerveenfiber bundles that leave the CNS above the spinal cord. Except for the vagus nerve or parasympathetic nerve, which extends into the abdominal cavity, the cranial nerves supply the head and neck region. Since the cranial nerves carry very long and cumbersome names, they were numbered consecutively with Roman numerals for simplicity's sake.