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Fig. 27. Diagram showing the expansion of amnion and delimitation of the umbilicus

--Mark Hill (talk) 12:38, 25 April 2013 (EST)

  • amnion - An extraembryonic membrane ectoderm and extraembryonic mesoderm in origin and forms the innermost fetal membrane, produces amniotic fluid. This fluid-filled sac initially lies above the trilaminar embryo disc and with embryoic disc folding this sac is drawn ventrally to enclose (cover) the entire embryo, then fetus. The presence of this membane led to the description of reptiles, bird, and mammals as amniotes.
  • umbilicus - Term used to describe the navel region, in the embryo anatomically associated with the placental cord, midgut herniation and the allantois.


Early embryo membrane development cartoons: Image 24 | Image 25 | Image 26 | Image 27 | Image 28



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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, May 26) Embryology Gray0027.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Gray0027.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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