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عمومی::
سوراخ بزرگ پسسری (فورامن مگنوم)
The pons lies squashed against the clivus, a region of bone resembling a slide that extends to the foramen magnum, the hole at the base of the skull where the spinal cord becomes the brain stem (Fig. 5).
Sometimes the brain stem does "slide down" the clivus, herniating into the foramen magnum.
It is a spinal nerve which creeps through the foramen magnum, touches the vagus and comes back down again via the jugular foramen.
The sympathetic chain stretches from the foramen magnum to the coccyx and supplies the far reaches of the body with post-ganglionic sympathetic fibers.
The presence of cranial nerve involvement signifies that the lesion lies above the level of the foramen magnum.
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