Embryology of the Human Brain

Abstract

In this paper, the process of CNS development in human embryos and fetuses is described. The primordium of the nervous system appears as early as during the third week after fertilization, but its differentiation and maturation require a considerably long period of time until after birth. Therefore, the developing brain is vulnerable to various kinds of deleterious environmental effects during the preand perinatal life. This paper aims at giving an overview of the major organogenesis of the brain in human embryos and fetuses.