The limbic system The limbic system consists of the phylogenetically old limbic lobe and other subcortical structures and their connections. Although not empirically proven, the limbic system is a functional concept which may be employed to explain various brain functions. There is no universal agreement on the total list of structures, which comprise the limbic system. The brain regions that constitute the limbic system are: These structures form a complex network for controlling emotions as fear, rage and placidity, olfaction, appetite and eating behaviors, sleep and dreams, sexual behavior, memory, addiction, social cognition and motivation. Click here to go to Google Click here to go to "Trastornos Psicológicos" Click to answer the poll