![Elementary text-book of zoology [electronic resource]. Zoology. 468 CHORD ATA. The yolk-sac placenta is a functional organ in the Meta- theria. In them the zonal placental area extends upwards till it](https://c8.alamy.com/comp/RJN85H/elementary-text-book-of-zoology-electronic-resource-zoology-468-chord-ata-the-yolk-sac-placenta-is-a-functional-organ-in-the-meta-theria-in-them-the-zonal-placental-area-extends-upwards-till-it-covers-the-greater-part-of-the-upper-half-of-the-blastocyst-and-probably-largely-replaces-the-prokalymma-at-the-lower-pole-the-allantois-in-metatheria-degenerates-and-eventually-loses-its-connection-with-the-serosa-though-in-certain-forms-it-may-remain-attached-over-a-small-disc-like-area-and-form-indeed-a-true-allantoic-placenta-fig-292diagram-of-the-fctal-membranes-of-a-mammal-f-RJN85H.jpg "Elementary text-book of zoology [electronic resource]. Zoology. 468 CHORD ATA. The yolk-sac placenta is a functional organ in the Meta- theria. In them the zonal placental area extends upwards till it")
Elementary text-book of zoology [electronic resource]. Zoology. 468 CHORD ATA. The yolk-sac placenta is a functional organ in the Meta- theria. In them the zonal placental area extends upwards till it
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Yolk sac - Wikipedia
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Translational Comparison of the Human and Mouse Yolk Sac Development and Function | SpringerLink
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Centennial Review: The chicken yolk sac is a multifunctional organ - ScienceDirect
The extravillous circulations. The yolk sac is the first of the... | Download Scientific Diagram
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