An oval opening in the occipital bone, at the base of the skull; the point at which the spinal cord passes and joins the brain stem. As it relates to a Chiari Malformation Type 1, both the cerebellum and the whole of the brainstem, should be above the Foramen Magnum.
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Posterior Fossa
A small space in the skull; part of the cranial cavity located between the foramen magnum and cerebellar tentorium (tentorium cerebelli).
