Hypoblast

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

In amniote embryology, the hypoblast is one of two distinct layers arising from the inner cell mass in the mammalian blastocyst, or from the blastodisc in reptiles and birds. The hypoblast gives rise to the yolk sac.

Excerpt from the Wikipedia article “Hypoblast”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Panzer VI-II, CC BY-SA 3.0, via Wikimedia Commons.