Yolk Sac Development
|Embryology - 15 Dec 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.
|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.|
- 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, December 15) 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