The sigmoid sinus, which penetrates the jugular foramen, leaves the skull as the external jugular vein.

Name: The sigmoid sinus, which penetrates the jugular foramen, leaves the skull as the external jugular vein.
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The sigmoid sinus does penetrate the jugular foramen, but it actually leaves the skull as the internal jugular vein. The external jugular vein is formed by the union of multiple veins in the neck, and it does not directly connect to the sigmoid sinus.

The Sigmoid Sinus, Which Penetrates the Jugular Foramen, Leaves the Skull