Find the word definition


n. The process by which an embryo is formed and develops.


Embryogenesis is the process by which the embryo forms and develops. In mammals, the term refers chiefly to early stages of prenatal development, whereas the terms fetus and fetal development describe later stages.

Embryogenesis starts with the fertilization of the egg cell (ovum) by a sperm cell, (spermatozoon). Once fertilized, the ovum is referred to as a zygote, a single diploid cell. The zygote undergoes mitotic divisions with no significant growth (a process known as cleavage) and cellular differentiation, leading to development of a multicellular embryo.

Although embryogenesis occurs in both animal and plant development, this article addresses the common features among different animals, with some emphasis on the embryonic development of vertebrates and mammals.

Usage examples of "embryogenesis".

We know that the basic architecture of the brain is formed during embryogenesis, and that the brain is al­ready remarkably well organized in its basic plan by the beginning of fetal life, after only eight weeks of gestation.