The Jugular Foramen: Imaging Strategy and Detailed Anatomy at 3T

Petrosal and sigmoid parts of the JF. Axial CE-MRA image demonstrates the petrosal and sigmoid parts of the JF as well as the cranial nerves within the intrajugular compartment. The thick white arrow marks the right interjugular process of the occipital bone; the black arrow depicts the dural septum between the petrosal and sigmoid part of the JF. Asterisks mark the drainage of the inferior petrosal sinus into the jugular bulb between CNIX anterolaterally (dotted arrows) and the CNX/XI complex at the level of the supCNX posteromedially (thin white arrow). 1 indicates the ICA; 2, the inferior petrosal sinus; 3, the sigmoid sinus.