Biological significance of olfactory analyzer, evolutional mechanisms of genesis of this sensory system that for the most part depend on habitat change and change of animals’ mode of existence are described.
Morphofunctional base and influence of a human’s olfacto-vegetative system to the vegetative regulation are shortly adduced. Stated facts about development, structure and functioning of olfactory analyzer along with ANS are of practical interest about interpretation of some phenomena related to its disfunctions and observed in clinic.