At the behest of the Developmental biology, is designated as ontogeny to conformation and development of the person, especially in the embryonic stage.
Thanks to ontogeny, then, we can know in depth how is the development of an organism, that is, from the moment in which the ovum is fertilized by the sperm, passing through its adult stage and until its aging.
It should be noted that this development has two important functions, on the one hand, the generation of cell diversity, organizing the different types of cells in tissues and organs, and on the other hand ensuring the continuation of life from generation to generation.
Ontogeny, also called morphogenesis or ontogenesis It is divided into different phases such as: fertilization (In fertilization, the union of the two gametes occurs with the relevant conformation of the egg or zygote; it is worth noting that the gametes can be the same or different), activation (In this phase a series of phenomena will take place in the conformed zygote and which are the ones that will end up causing it to begin to segment by mitosis) and the embryogenesis (This is the name of the set of processes that comprise the moment from which the zygote begins to fragment and until organogenesis actually occurs).
Within embryogenesis there will be several phases that we will list below: segmentation (In this the zygote will be divided into numerous smaller cells known as blastomeres), blastulation (the formation of the blastula: the body already has more than 64 cells, its appearance being similar to that of a spherical body), gastrulation (Already from the blastula state, in this phase the germinative leaves take place: ectoderm and endoderm; the first produces the cells of the epidermis and the nervous system and the second produces the cells that cover the digestive tract as well as the associated organs; and the mesoderm, the third leaf that is formed in metazoans, favors the formation of organs such as the heart, kidneys, among others, connective and supporting tissues and blood cells) and organogenesis (It implies the interaction and movements that lead to the formation of the organs).
