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mesoderm |
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mesoderm, in biology, middle layer of tissue formed in the gastrula stage of the developing embryo. At the end of the blastula stage, cells of the embryo are arranged in the form of a hollow ball. Continued cell movement results in an invagination of the bottom region of the embryo, producing a form that resembles a double-layered cup. A third layer, the mesoderm, is formed between the other two by growth of cells derived from a marginal zone. The mesoderm is the germ layer that forms many muscles, the circulatory and excretory systems, and the dermis, skeleton, and other supportive and connective tissue. It also gives rise to the notochord notochord (nō`təkôrd') ..... Click the link for more information. , a supporting structure between the neural canal and the primitive gut. In many animals, including vertebrates, the mesoderm surrounds a cavity known as the coelom coelom (sē`ləm), fluid-filled body cavity, found in animals, which is lined by cells derived from mesoderm tissue in the embryo , ..... Click the link for more information. , the space that contains the viscera. See embryo embryo (ĕm`brēō), name for the developing young of an animal or plant. ..... Click the link for more information. . How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Epidermoids are distinct from dermoid cysts in that they do not contain skin appendages or mesoderm elements such as hair and sebaceous glands. Average methylation in day 21 tail tissues from a subset of genistein-supplemented animals (n = 5) was highly correlated with average methylation in day 150 tissues derived from the ectoderm (brain and tail), mesoderm (kidney), and endoderm (liver) (Figure 4). This included men with either Seminoma (made up of primarily young germ cells, growing slowly, staying relatively immobile, and accoungint for 40 percent of testicular cancers) or Teratoma (consisting of cysts that contain one or more of the three main types of cells present in embryos--ectoderm, mesoderm, and endoderm cells) type cancers and a range of time lags in seeking medical help. |
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mesoderm
