The prosencephalon is the rostral-most portion of the brain. The forebrain, the midbrain, and hindbrain are the three primary portions of the brain during early development of the central nervous system. It controls body temperature, reproductive functions, eating, sleeping, and any display of emotions.
At the five-vesicle stage, the forebrain separates into the diencephalon and the telencephalonwhich develops into the cerebrum. The cerebrum consists of the cerebral cortex, underlying white matter, and the basal ganglia.