Spinal cord exits the foramen magnum in the Occipital bone.
Dura mater completely encases brain and spinal cord. Notice that the Pituitary gland rests on the Sella turcia of the Basisphenoid. Arbor vitae of the Cerebellum, Midbrain, and Cerebrum are visible as well as Fornix, Corpus collossum, Lateral, Third, and Fourth ventricles.