AskDefine | Define endoderm

Dictionary Definition

endoderm n : the inner germ layer that develops into the lining of the digestive and respiratory systems [syn: entoderm, endoblast, entoblast, hypoblast]

User Contributed Dictionary



  1. One of the three tissue layers in the embryo of a metazoan animal. Through development, it will produce the digestive system of the adult.

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Extensive Definition

Endoderm, (sometimes called Entoderm) is one of the germ layers formed during animal embryogenesis. Cells migrating inward along the archenteron form the inner layer of the gastrula, which develops into the endoderm.
The endoderm consists at first of flattened cells, which subsequently become columnar. It forms the epithelial lining of the whole of the digestive tube except part of the mouth, pharynx and the terminal part of the rectum (which are lined by involutions of the ectoderm), the lining cells of all the glands which open into the digestive tube, including those of the liver and pancreas, the epithelium of the auditory tube and tympanic cavity, of the trachea, bronchi, and alveoli of the lungs, of the urinary bladder and part of the urethra, and that which lines the follicles of the thyroid gland and thymus.


The following graph represents the products produced by the endoderm.

Additional images



  • Evers, Christine A., Lisa Starr. Biology:Concepts and Applications. 6th ed. United States:Thomson, 2006. ISBN 0-534-46224-3.
endoderm in Arabic: أديم باطن
endoderm in Czech: Entoderm
endoderm in Danish: Endoderm
endoderm in German: Entoderm
endoderm in Spanish: Endodermo
endoderm in Esperanto: Endodermo
endoderm in French: Endoderme
endoderm in Italian: Endoderma
endoderm in Dutch: Endoderm
endoderm in Polish: Endoderma (zoologia)
endoderm in Portuguese: Endoderme
endoderm in Serbian: Ендодерм
endoderm in Finnish: Endodermi
endoderm in Swedish: Endoderm
endoderm in Turkish: Endoderm
endoderm in Ukrainian: Ентодерма
endoderm in Chinese: 内胚层
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