Dictionary:
en·do·derm (ĕn'də-dûrm') also en·to·derm
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| Columbia Encyclopedia: endoderm |
| Veterinary Dictionary: entoderm |
The innermost of the three primitive germ layers of the embryo; from it are derived the epithelium of the pharynx, respiratory tract (except the nose), digestive tract, bladder and urethra.
| Wikipedia: Endoderm |
| Endoderm | |
|---|---|
| Blastodermic vesicle of Vespertilio murinus. (Endoderm labeled as 'entoderm'.) | |
| Gray's | subject #6 49 |
| Days | 16 |
| Precursor | hypoblast |
| Gives rise to | splanchnopleure |
| MeSH | Endoderm |
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 entire alimentary canal 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.
Contents |
The following chart shows the products produced by the endoderm.
| Germ Layer | Category | Product |
|---|---|---|
| Endoderm | General[1] | Gastrointestinal tract |
| Endoderm | General | Respiratory tract |
| Endoderm | General | Endocrine glands and organs (liver and pancreas) |
The Endoderm has differentiated into distinguishable organs as early as 5 weeks of embryonic development.
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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.
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| endomere (embryology) | |
| entoblast (embryology) | |
| gastrulation (embryology) |
| What structure will the endoderm develop too? | |
| Does endoderm have three germ layers? | |
| What organ can form from endoderm? |
Copyrights:
![]() | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more | |
![]() | Columbia Encyclopedia. The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2003, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/. Read more | |
![]() | Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved. Read more | |
![]() | Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Endoderm". Read more |
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