Homeostasis, limbic system and superior functions of the Central Nervous System. Hormonal bases of mood disorders "the hypothalamus - hypophysis - adrenal axis". Autonomic nervous system. Adrenal medulla, stress and adaptation. Neurotransmitters of mental illness. Neurobiology of the main mental disorders.Depression, Obsessive-Compulsive Disorder, Post-traumatic stress disorder and Drug addiction. Mechanisms of action of the most commonly used psychotropic drugs and of the main drugs of abuse.