The limbic system is one of the keys areas of the brain which makes us humans and not robots. This particular area is relatively primal in nature compared to other sections (such as the cerebral cortex and the frontal lobe), but it is essential for our survival and is also associated with some of the more stimulating things in life.
There are six key anatomical structures within the limbic system as demonstrated by the picture below:
The key structures include the following:
The main functions that these six areas serve include the production of our emotional states and the examination of the motivation behind these states. These emotional states include essential survival emotions such as fear and anger as well as pleasure; derived from either the ingestion of food or via sexual means.