The frog of vertebrate is classified as amphibian, which is one of the basic models of embryonic training because it has two types of life. It breathes through the gills during its embryonic formation while breathing through the lungs when it is fully developed. The sexes are separate and the fertilization is external and the spawning type is not equal because of the concentration of the mole in the vegetative pole of the frog egg. The stage of the plastiola comes in which the cavity is upper and not central because of the area. The gastrolea is composed of two stages: an early stage characterized by the appearance of the dorsal lip, and a late stage characterized by the appearance of the dorsal lip, abdominal lip and the occipital stump followed by the stage of organ formation.
