Neuroendocrinology is regarded as an area of knowledge which has emerg
ed at the interface of two disciplines: neurobiology and endocrinology
in the course of accumulation of new endence within each. The evidenc
e is strong to evidence that the neurons involve endocrine properties,
including the ability to secrete hormones. Strong evidence is given t
hat only the neuroendocrinological approach can explain many mysterous
phenomena known in the physiology of the central and autonomic nervou
s system, which could not have been interpreted by neurobiologists for
many years. Neuroendocrinology has provided insight into brain functi
ons and lifted the veil over its mysteries. The latters include the se
xual brain differentiation phenomenon which is analysed at the end of
the present communication.