endoderm

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endoderm

endoderm , 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 ; a middle layer, the mesoderm , 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 .

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endoderm

A Dictionary of Zoology | 1999 | | Â© A Dictionary of Zoology 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

endoderm In an embryo, the innermost layer of cells that gives rise to the lining of the archenteron (digestive cavity) and its associated glands. See also GASTRULATION.

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MICHAEL ALLABY. "endoderm." A Dictionary of Zoology. 1999. Encyclopedia.com. 10 Jul. 2009 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "endoderm." A Dictionary of Zoology. 1999. Encyclopedia.com. (July 10, 2009). http://www.encyclopedia.com/doc/1O8-endoderm.html

MICHAEL ALLABY. "endoderm." A Dictionary of Zoology. 1999. Retrieved July 10, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-endoderm.html

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endoderm

A Dictionary of Biology | 2004 | Â© A Dictionary of Biology 2004, originally published by Oxford University Press 2004. (Hide copyright information) Copyright

endoderm (entoderm) The internal layer of cells of the gastrula, which will develop into the alimentary canal (gut) and digestive glands of the adult. See also germ layers.

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