File:Gray0026.jpg
From Embryology
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Fig. 26. Diagram showing stage of allantoic development with commencing constriction of the yolk-sac
Diagram showing later stage of allantoic development with commencing constriction of the yolk-sac.
--Mark Hill (talk) 12:38, 25 April 2013 (EST)
- yolk sac - An extraembryonic membrane which is endoderm origin and covered with extraembryonic mesoderm. Yolk sac lies outside the embryo connected initially by a yolk stalk to the midgut with which it is continuous with. 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 development (week 2) a structure called the "primitive yolk sac" forms from hypoblast, this is an entirely different structure.
Early embryo membrane development cartoons: Image 24 | Image 25 | Image 26 | Image 27 | Image 28
- Gray's Images: Development | Lymphatic | Neural | Vision | Hearing | Somatosensory | Integumentary | Respiratory | Gastrointestinal | Urogenital | Endocrine | Surface Anatomy | iBook | Historic Disclaimer
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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding. (More? Embryology History | Historic Embryology Papers) |
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Reference
Gray H. Anatomy of the human body. (1918) Philadelphia: Lea & Febiger.
Cite this page: Hill, M.A. (2024, April 19) Embryology Gray0026.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Gray0026.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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- 2009 Lecture 8
- 2010 Lecture 8
- ANAT2341 Lab 4 - Implantation and Villi Development
- ASA Meeting 2013 - Placenta
- Anatomy of the Human Body by Henry Gray
- BGDA Practical Placenta - Implantation and Early Placentation
- Coelomic Cavity Development
- Lecture - Placenta Development
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