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Take a small unstretched and not too dense rubber ballhaving approximately a diameter of about inch, with a small hole,through which when pressed can leave the air. Supposeinstead of rubber, the wall consists of small cells, connected to each otherand became, owing to mutual pressure, in the form of a multifaceted. It will beto represent the blastoderm. Now press your finger to one side of the ball untillong as it does not touch the other hand in such a way that willcalyx. This action will replace the process of intussusception. Imaginethat by continuing this process, the hemispherical Cup becomesvery deep and her hole is narrowed as long as the Cup is notwill take the form of a bag, whose inner wall is everywhere in contact with theouter. This pouch will be a consisting of two layers,the simplest ancestral form of the Metazoa - the "gastrula": the form that youpermanently retain some of the lower types; all it needs is tentaclessurrounding the opening of the pouch, in order to obtain an ordinary Hydra.Here we especially note the fact that of these two layers,outer called, according to embryological terminology èpiblastom,continues to communicate with the external forces and substances between theas internal called gipoblastom, comes in contact only withsuch substances that are made to surround them with a food cavity. Weshould in addition, notice that in embryos with a more advanced Metazoathe organization appears between these two layers is a third, calledmesoblast. It is noticeable those types of who have a processdevelopment is not dimmed by the presence of a large number of nutrientsyolk. While the above impression and before the internalthe surface of epiblast and gipoblasta will come in contact between them, fromone or both of these inner surfaces, or from anyplot one or the other of them separated cells or their equivalentamoeboid individuals, which form everywhere between the other twolayer, never having, as is clear from the way it iseducation, communication with the external environment and its contents, as well as with getfrom her nutrients.
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