hypoblast
Sign in to saveIn 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.
Key facts
- Embryology.Name
- Hypoblast
- Embryology.Latin
- hypoblastus
- Embryology.Image
- File:Human Embryo Day9.png
- Embryology.Caption
- Human embryo on day 9. Hypoblast (brown) is beneath the epiblast (pink)
- Embryology.Caption2
- "D" points to the hypoblast.
- Embryology.Days
- 8
- Embryology.Precursor
- Inner cell mass
- Embryology.GivesRiseTo
- Endoderm, yolk sac
via Wikipedia infobox
Wikidata facts
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- Commons category
- Hypoblast
- native label
- hypoblastus
Sources (1)
via Wikidata · CC0
~8 min read
Article
8 sectionsContents
- Structure
- Function
- Amniotes
- Birds
- Mammals
- Fish
- Genetics
- References
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.
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.