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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.

The two lateral ventricles separated by the septum pellucidum are next to the heads of the caudate nucleus.  The genu of the internal capsule, is lateral to the interventricular foramen in the interval between the head of caudate and the rostal end of the thalamus. The posterior commissure is above the entry to the cerebral aqueduct.