What is hypoblast?

Hypoblast

The hypoblast is a tissue type that forms from the inner cell mass. It lies beneath the epiblast and consists of small cuboidal cells.

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Some articles on hypoblast:

Human Embryogenesis - Inner Cell Mass Differentiation
... forms a bilaminar (two layered) embryo, composed of the epiblast and the hypoblast ... is adjacent to the trophoblast and made of columnar cells the hypoblast is closest to the blastocyst cavity, and made of cuboidal cells ... The hypoblast, or primitive endoderm, will give rise to extraembryonic structures only, such as the lining of the primary (primitive) yolk sac (exocoelomic ...
Bilaminar Blastocyst - Becoming Bilaminar
... into two layers the epiblast and hypoblast also called the primitive endoderm ... cavity finds a home between the epiblast and the hypoblast ... The rest of the hypoblast and epiblast, not including the amnion, is what contributes to the bilaminar embryonic disc (bilaminar blastoderm/blastocyst ...
Hypoblast
... The hypoblast is a tissue type that forms from the inner cell mass ... endoderm (including Yolk sac) is derived from the epiblast which displaces the hypoblast cells ... The absence of hypoblast results in multiple primitive streaks in chicken embryos ...
Primitive Streak - Formation - Hypoblast
... The hypoblast secretes an antagonist of Nodal that prevents ectopic streak formation in the chick ...