| Forebrain (n.) The anterior of the three principal divisions of the brain, including the prosencephalon and thalamencephalon. Sometimes restricted to the prosencephalon only. See Brain. Thesaurus Entries arachnoid, arbor vitae, archipallium, between brain, brain stem, cerebellar hemispheres, cerebral cortex, cerebrospinal fluid, cerebrum, convolution, corpus callosum, corpus striatum, diencephalon, dura mater, endbrain, fissure, folia, forebrain, fornix, frontal lobe, glial cells, globus pallidus, gray matter, gyrus, hindbrain, hippocampus, hypothalamus, lenticular nucleus, limbic lobe, little brain, lobe, mantle, medulla oblongata, meninges, mesencephalon, metencephalon, midbrain, myelencephalon, neopallium, occipital lobe, optic chiasm, pallium, parietal lobe, pia mater, pineal body, pituitary body, pons, reticular system, rhombencephalon, subthalamus, telencephalon, temporal lobe, thalamus, ventricle, vermis, white matter |