NeuroAtlas › Modernized Anatomy › Brain and spinal cordDorsal aspect of medulla oblongata and mesencephalon, showing the floor of the fourth ventricle (rhomboid fossa)Free account unlocks full-resolution zoom and pan. Sign up freeLog inAfter Morris's Human Anatomy; modernized for Neuro.Wiki‹ Dorsal surface of mesencephalon and adjacent partsAll platesVentral aspect of brain-stem including mammillary and optic portions of the hypothalamus. insula ›