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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Universalium. 2010.

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