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With the removal of the cortex, corpus callosum, and fornix, you can look down into the third ventricle.  In the depths of the third ventricle, the massa intermedia bridges between the two halves of the thalamus, and, in front of that, the right interventricular foramen of Monro is visible as the space behind the cut stump of the fornix. Click again on the picture for a closer look and more information.