central sulcus frontal lobe of cerebrum parietal lobe of cerebrum occipital lobe of cerebrum corpus callosum septum pellucidum & interventricular foramen fornix choroid plexus of 3rd ventricle thalamus hypothalamus optic chiasm infundibulum (stalk) of pituitary gland mamillary body Cr. nerve III (Oculomotor n.) mesencephalon pons cerbellar peduncles (part of cerebellum) medulla oblongata beginning of spinal cord (arbitrary designation here) vermis of cerebellum cerebellum pineal body superior colliculus (part of corpora quadrigemina) cerebral aqueduct connecting 3rd & 4th ventricles 4th ventricle cerebellum showing arbor vitae and folia location of tentorium cerebelli (not shown)