Abnormal skull base morphology Jugular foramen stenosis 2024-02-24T19:28:00Z Reduction in diameter of the jugular foramen, an opening in the base of the skull that is located behind the carotid canal and is formed by the temporal bone and the occipital bone. The inferior petrosal sinus, three cranial nerves, the sigmoid sinus, and meningeal arteries pass through the jugular foramen.