In sagittal section, the corpus callosum, the great white central commissure of the cerebral hemispheres, arches above the third ventricle. The lateral radiations of the corpus callosum lie atop the superior horns of the lateral ventricles. Part of the thalamus is seen forming the lateral wall of the third ventricle, and inferior recesses lie above the optic chiasm and the pituitary stalk. The arachnoid spaces around the base of the brain and brain stem are enlarged forming cisterns. The cerebral aqueduct (Sylvius) connects the third and fourth ventricles and the central foramen of Magendie is seen in the inferior velum of the fourth ventricle.
Dr. Robert Heim, Chief of Neurosurgery, Bethesda Naval Hospital
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