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endoderm |
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endoderm (ĕn`dədûrm'), in biology, inner 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. Cell movement results in an invagination of the bottom region, or vegetal hemisphere, of the embryo so that it resembles a double-walled cup. The inner layer of the cup is the endoderm; the outer layer is the ectoderm ectoderm, layer of cells that covers the surface of an animal embryo after the process of gastrulation has occurred. This outer layer, together with the endoderm , or inner layer, is present in all early embryos. ..... Click the link for more information. ; a middle layer, the mesoderm 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. ..... Click the link for more information. , forms from a marginal zone. The endoderm is the germ layer from which are formed the digestive system, many glands, and part of the respiratory system. See embryo embryo (ĕm`brēō), name for the developing young of an animal or plant. ..... Click the link for more information. . endoderm [′en·dō‚dərm] (embryology) The inner, primary germ layer of an animal embryo; sometimes referred to as the hypoblast. Also known as entoderm; hypoblast. 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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| 3) If, after reaching its most cephalic position, the notochord retains an attachment to the pharyngeal endoderm as it regresses toward the skull base, an invagination of the developing pharyngeal mucosa is created. 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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