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 ?
Using zebrafish as a vertebrate model organism, we will explore how germ layer progenitor cell fate specification affects the physical processes by which the gastrula takes shape, and, vice versa, how alterations in cell/tissue mechanics feed back onto the gene regulatory networks and signals controlling progenitor cell fate specification during gastrulation.
The human brain arises from the germ layer called ectoderm that gives rise to nails, hairs, enamel of the tooth, sensory epithelium of the ear, nose and eye, skin.
We then measured mutations in three somatic tissues derived from each germ layer (ectoderm: brain; mesoderm: bone marrow; endoderm: liver) using the recoverable lacZ reporter transgene within the Muta[TM]Mouse genome (Lambert et al.
Human cells derived from embryos before implantation, on the other hand, are also known to differentiate into each germ layer, but not consistently in the lab.
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.
fertilized egg cell or zygote), that can generate all cell and tissue types present in an organism; Pluripotent stem cells (like embryonic stem cells) can generate the majority of cell and tissue types present in an organism; multipotent stem cells (like mesenchymal stem cells [MSC]) can generate a limited number of cell and tissue types, usually dependent on their germ layer of origin.
The first covers cell evolution and development, discussing the neural crest as a fourth germ layer, cellular processes and signaling involved in neural crest formation, epigenetic regulation, and tissue interactions in species-specific pattern.
However, hundreds of studies have found tremendous health benefits related to whole grain consumption--grains that are intact and possess their outer layer of bran, their starchy endosperm layer, and their inner germ layer.
According to Streckfuss-Bomeke et al, Germ-line Stem Cells (GSCs) are capable of self-renewal and differentiating into all germ layer derivatives.
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.
A shift in germ layer allocation is correlated with large egg size and facultative planktotrophy in the echinoid Clypeaster rosaceus, 192