Remember, the accessory nerve, cranial nerve XI passes through the jugular foramen and also through the foramen magnum. It’s got two roots. You’ve got the roots up here and the spinal roots, which pass through the foramen magnum.he jugular foramen has loads of structures that pass through it. It’s called the ‘jugular foramen’ for a reason, because the internal jugular passes through it. I’ve just flipped back to the base of the skull view.