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( Mesoderm)
One of the three germ layers found in the embryos of animals more complex than cnidarians, making them triploblastic. Mesoderm forms during gastrulation when some of the cells migrating inward to form the endoderm, produce an additional layer that lies between the endoderm and the ectoderm. Mesoderm is found in all large, complex animals, and allows the formation of a coelom, which allows more room for independent growth of the body organs and the coelomic fluid may also act to cushion and protect them from shocks. Not all triploblastic animals have a coelom, like the simplest animals with organs that form from three tissue layers flatworms. There are three different ways in which the mesoderm is found aligned with the ectoderm and these form a method of categorizing animals into three broad groupings. The body organs, tissues and systems derived from the mesoderm in most triploblastic animals can be listed as follows
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