endoderm

endoderm
—endodermal, endodermic, adj.
/en"deuh derrm'/, n.
1. Also called endoblast. Embryol. the innermost cell layer of the embryo in its gastrula stage.
2. Anat. the innermost body tissue that derives from this layer, as the gut lining. Also, entoderm.
[1825-35; < F endoderme; see ENDO-, -DERM]

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▪ embryo
      the innermost of the three germ layers, or masses of cells (lying within ectoderm and mesoderm), which appears early in the development of an animal embryo. The endoderm subsequently gives rise to the epithelium (tissue that covers, or lines, a structure) of the pharynx, including the eustachian tube, the tonsils, the thyroid gland, parathyroid glands, and thymus gland; the larynx, trachea, and lungs; the gastrointestinal tract (except mouth and anus), the urinary bladder, the vagina (in females), and the urethra. The term endoderm is sometimes used to refer to the gastrodermis, the simple tissue that lines the digestive cavity of cnidarians and ctenophores. Compare ectoderm; mesoderm.

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  • endoderm — noun Etymology: French endoderme, from end + Greek derma skin more at derm Date: 1861 the innermost of the three primary germ layers of an embryo that is the source of the epithelium of the digestive tract and its derivatives and of the lower… …   New Collegiate Dictionary

  • Endoderm — Das Entoderm (von griech. to enteron „Darm“, eigentlich „das Innere“ und to derma „Haut“) ist das innere Keimblatt des Embryoblasten. Das Entoderm ist nicht zu verwechseln mit der Endodermis der Pflanzen. Aus dem Entoderm bilden sich die… …   Deutsch Wikipedia

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