germ layer


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germ layer

n.
Any of three cellular layers, the ectoderm, endoderm, or mesoderm, into which most animal embryos differentiate and from which the organs and tissues of the body develop through further differentiation.

germ layer

n
(Biology) embryol any of the three layers of cells formed during gastrulation. See ectoderm, mesoderm, endoderm

germ′ lay`er


n.
any of the three primary embryonic cell layers. Compare ectoderm, endoderm, mesoderm.
[1875–80]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.germ layer - (embryology) any of the 3 layers of cells differentiated in embryos following gastrulation
embryonic tissue - tissue in an embryo
ectoblast, ectoderm, exoderm - the outer germ layer that develops into skin and nervous tissue
mesoblast, mesoderm - the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue
endoblast, endoderm, entoblast, entoderm, hypoblast - the inner germ layer that develops into the lining of the digestive and respiratory systems
embryology - the branch of biology that studies the formation and early development of living organisms
References in periodicals archive ?
ES cells have distinct characteristics such as self-renewal and pluripotency, differentiating into all three germ layer and germ cell lineages (Kondoh et al.
As shown in Figure 4C to 4E, we confirmed the expression of three germ layer markers, including cytokeratin17 (endoderm), vimentin (mesoderm), and neurofilament (ectoderm) from differentiated cells in the ICC analysis.
Objective: Mesoderm, the embryonic germ layer between ectoderm and endoderm, gives rise to major organs within the circulatory and excretory systems and to stabilizing tissues (muscles, bones, connective tissue).
Cementoossifying fibroma is a rare nonodontogenic tumor of the periodontal membrane that arises from the mesodermal germ layer This nonneoplastic, locally destructive tumor has occurred as an osseous lesion in the mandible, the maxilla, the zygoma, all the paranasal sinuses, and the orbital and petromastoid regions.
The low variability in CpG methylation among the three germ layer tissues relative to high variability between individual animals indicates that the establishment of epigenotype at the [A.
Previously, it was believed that germ layer boundaries could not be crossed.
We have devised guidance protocols for mouse and human embryonic and reprogrammed stem cells toward inner ear cell types that make use of principles of early germ layer formation and otic induction.
These cells are pluripotent and thus they retain long-term proliferative potential in an undifferentiated state, and can differentiate into derivatives of all three embryonic germ layers on in vitro differentiation culture conditions or an in vivo environment (Thomson et al.
According to Thompson, teratomas contain tissue from all three embryonic germ layers.