Amniotic Cavity Development Movie

Embryology - 23 Apr 2024 Expand to Translate
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<mediaplayer width='268' height='260' image="http://embryology.med.unsw.edu.au/embryology/images/e/e1/Amnion_001_icon.jpg">File:Amnion 001.mp4</mediaplayer>

This animation shows the development of the extraembryonic coeloms. In humans, during week 8 the chorionic cavity is lost by fusion with the expanding amniotic cavity.

Note that as the yolk sac (yellow) is continuous with the midgut you can also follow development of the gastrointestinal tract regions of foregut, midgut and hindgut.

Embryo and placental membranes are shown to the left and the developing placenta is shown to the right.

yellow - outside embryo yolk sac (circular balloon) and inside embryo gastrointestinal tract regions (foregut, midgut and hindgut)
blue - amniotic cavity
white - chorionic cavity surrounding amnion and yolk sac

Terms

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.

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Cite this page: Hill, M.A. (2024, April 23) Embryology Amniotic Cavity Development Movie. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Amniotic_Cavity_Development_Movie

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