Osseous Anatomy

The bony limits of this passageway are the petrous portion of the temporal bone and the condylar portion of the occipital bone.2 A fibrous bridge divides the jugular foramen in 75 to 92% of cadaveric specimens evaluated, and a bony septum in the remaining 8 to 25%.2 After the evaluation of human dry cadaveric skulls, it has been determined that the size of the jugular foramen is larger on the right than on the left in approximately 70% of specimens, larger on the left in 20%, and of the same size on both sides in 10%.2-5 The anterior margin of the jugular foramen is formed by the carotid ridge, which separates the jugular bulb from the C2 segment of the internal carotid artery (ICA)6 in the carotid canal.

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