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One of the three germ layers found in the embryos of animals more complex than cnidarians, making them triploblastic. Mesoderm forms in the embryo 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.
[edit] Mesoderm Derivatives
[edit] General
The body organs, tissues and systems derived from the mesoderm in most triploblastic animals can be listed as follows:
[edit] Vertebrates
Transverse section of a chick embryo of forty-five hours' incubation.
*
Chordamesoderm: yellow, at the
notochord. *
Paraxial mesoderm: red, comprising the
somites. *
Intermediate mesoderm: purple, which includes the
Wolffian duct. *
Lateral plate mesoderm: purple, comprising somatic and
splanchnic mesoderm.
Before formation of the items in the above list, the mesoderm of a developing vertebrate transitionally differentiates into the following sub-types:
[edit] See also
[edit] References
- Evers, Christine A., Lisa Starr. Biology:Concepts and Applications. 6th ed. United States:Thomson, 2006. ISBN 0-534-46224-3.
[edit] External links
