Hypoblast

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Hypoblast

Section through the embryo. (Hypoblast visible but not labeled.)

"D" points to the hypoblast.
Latin	hypoblastus
Days	8
Precursor	inner cell mass
Gives rise to	endoderm
Code	TE E6.0.1.1.3.0.4

The hypoblast is a tissue type that forms from the inner cell mass.^[1] It lies beneath the epiblast and consists of small cuboidal cells.^[2]

Extraembryonic endoderm (including Yolk sac) is derived from hypoblast.

[edit] References

^ UNSW Embryology- Glossary H
^ Moore, K. L., and Persaud, T. V. N. (2003). The Developing Human: Clinically Oriented Embryology. 7th Ed. Philadelphia: Elsevier. ISBN 0-7216-9412-8.

First three
weeks

Week 1

Week 2
(Bilaminar)

Hypoblast · Epiblast

Germ layers	Archenteron/Primitive streak (Primitive pit, Primitive knot/Blastopore, Primitive groove) · Gastrula/Gastrulation · Regional specification · Embryonic disc

Ectoderm	Surface ectoderm · Neuroectoderm · Somatopleuric mesenchyme · Neurulation · Neural crest

Endoderm	Splanchnopleuric mesenchyme

Mesoderm	Chorda- · Paraxial (Somite/Somitomere) · Intermediate · Lateral plate (Intraembryonic coelom, Splanchnopleuric mesenchyme/Somatopleuric mesenchyme)