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search The initial stages of human embryogenesis Parts of a
human embryo This article concerns Ontogeny in biology. Not to
be confused with the philosophy concepts of ontology, or the
medical term oncology, and odontology.  Ontogeny (also
ontogenesis or morphogenesis) is the origin and the development
of an organism: for example, from the fertilized egg to mature
form. In time frame, it can cover the study of an organism's
lifespan. The word ontogeny comes from the Greek ὄντος, ontos,
present participle singular of εἶναι, "to be"; and from the
suffix -geny, which expresses the concept of "mode of
production".[1] In more general terms, ontogeny is defined as
the history of structural change in a unity, which can be a
cell, an organism, or a society of organisms, without the loss
of the degree and type of organization which allow that unity to
exist.[2] More recently, the term ontogeny has been used in cell
biology to describe the development of various