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What (who) is hypoblast - definition

EMBRYONIC INNER CELL MASS TISSUE THAT FORMS THE YOLK SAC AND, LATER, CHORION

Endoblast; Primitive endoderm; Anterior visceral endoderm

Hypoblast

·noun The inner or lower layer of the blastoderm;

- called also endoderm, entoderm, and sometimes hypoderm. ·see ·Illust. of Blastoderm, Delamination, and Ectoderm.

hypoblast

['h??p?(?)blast]

¦ noun Biology former term for endoderm.

Hypoblast

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, which in turn gives rise to the chorion.

https://en.wikipedia.org/wiki/Hypoblast

Wikipedia

Hypoblast

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, which in turn gives rise to the chorion.

The hypoblast is a layer of cells in fish and amniote embryos. The hypoblast helps determine the embryo's body axes, and its migration determines the cell movements that accompany the formation of the primitive streak, and helps to orient the embryo, and create bilateral symmetry.

The other layer of the inner cell mass, the epiblast, differentiates into the three primary germ layers, ectoderm, mesoderm, and endoderm.

https://en.wikipedia.org/wiki/Hypoblast