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Answered by The Community. Making the world better, one answer at a time. The internal jugular vein is formed from the sigmoid sinus (after receiving the lesser petrosal sinus) just after passing through the jugular foramen to become the internal jugular vein.
They are the terminal parts of the dural venous sinuses that continue from the transverse sinuses at the level of the tentorium cerebelli. Just after the sigmoid sinus receives the inferior petrosal sinus, it forms a jugular bulb that enters the jugular foramen with CN IX (glossopharyngeal), CN X (vagus) and CN XI (accessory) as the internal jugular vein.