Fore brain

The human fore brain is comparatively much more evolved than any other animal. The prominent structures of the fore brain are thalamus, hypothalamus, limbic system, and the cerebrum. Hypothalamus secretes various hormones which in turn regulates behaviour. The most important role of the hypothalamus is to maintain internal consistency, a process referred to as homeostasis. Thalamus is situated above the hypothalamus and mediates impulses coming from all the sense organs except touch. Therefore, it is also called as the ‘relay station' of sensory messages. The limbic system is a union of cortical and subcortical structures such as hypothalamus, amygdala, hippocampus, septal area, mammillary bodies and cingulate gyrus. It modulates motivation, libido, appetite, and sleep cycle. It is directly involved in the processing of sense of smell. Remember that sexual behaviour has a strong affinity with pheromones and smell as well as libido is mediated by the limbic system. The limbic system also sets the normal as well as abnormal tone of the mind filtering the external events and tagging them as internally important.