Difference between revisions of "Yolk Sac Development"
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== References ==
== References ==
Revision as of 10:59, 28 October 2018
|Embryology - 12 Nov 2019 Expand to Translate|
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The yolk sac is an early extra-embryonic membrane which is endoderm origin and covered with extra-embryonic mesoderm. Yolk sac lies outside the embryo connected by a yolk stalk (vitelline duct, omphalomesenteric duct) to the midgut with which it forms a continuous connection. The endodermal lining is continuous with the endoderm of the gastrointestinal tract. The extra-embryonic mesoderm differentiates to form both blood and blood vessels of the vitelline system.
In reptiles and birds, the yolk sac has a function associated with nutrition. In mammals the yolk sac acts as a source of primordial germ cells and blood cells.
Note that in early human development (week 2) a transient structure called the "primitive yolk sac" forms from the hypoblast layer, this is an entirely different structure.
The yolk stalk normally degenerates around the time the midgut herniation is returned to the peritoneal cavity and the anterior body wall closes. Failure of complete degeneration of this structure can lead to a common intestinal abnormality, Meckel's diverticulum.
|Coelom Links: Introduction | Lecture - Week 3 Development | Lecture - Mesoderm Development | Placenta - Membranes | Category:Coelomic Cavity|
|Historic Embryology: 1891 peritoneal | 1897 human coelom | 1910 | 1924 serous|
Some Recent Findings
|More recent papers|
This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
Search term: Yolk Sac Development
<pubmed limit=5>Yolk Sac Development</pubmed>
|These papers originally appeared in the Some Recent Findings table, but as that list grew in length have now been shuffled down to this collapsible table.|
This GIT abnormality is a very common (incidence of 1–2% in the general population) and results from improper closure and absorption of the omphalomesenteric duct (vitelline duct) in development. This transient developmental duct connects the yolk to the primitive gastrointestinal tract.
In addition to Meckel's diverticulum there are a range of other vitelline duct abnormalities, which depend on the degree from a completely patent duct at the umbilicus to lesser remnants (cysts, fibrous cords connecting umbilicus to distal ileum, granulation tissue at umbilicus, or umbilical hernias).
- Links: GIT Abnormalities - Meckel's Diverticulum | OMIM - Meckel's Diverticulum | Pubmed - Meckel's Diverticulum | Pubmed - omphalomesenteric duct | Pubmed - vitelline duct
- Ariza L, Carmona R, Cañete A, Cano E & Muñoz-Chápuli R. (2016). Coelomic epithelium-derived cells in visceral morphogenesis. Dev. Dyn. , 245, 307-22. PMID: 26638186 DOI.
- Renda MC, Giambona A, Fecarotta E, Leto F, Makrydimas G, Renda D, Damiani G, Jakil MC, Picciotto F, Piazza A, Valtieri M & Maggio A. (2010). Embryo-fetal erythroid megaloblasts in the human coelomic cavity. J. Cell. Physiol. , 225, 385-9. PMID: 20533375 DOI.
Funayama N, Sato Y, Matsumoto K, Ogura T & Takahashi Y. (1999). Coelom formation: binary decision of the lateral plate mesoderm is controlled by the ectoderm. Development , 126, 4129-38. PMID: 10457021
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Cite this page: Hill, M.A. (2019, November 12) Embryology Yolk Sac Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Yolk_Sac_Development
- © Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G