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Related to blastoderm: blastodisc, area pellucida, Hensen's node


1. The layer of cells that develops on the surface of the yolk in an avian or reptilian egg and gives rise to the germinal disk from which the embryo develops.
2. The layer of cells formed by the cleavage of a fertilized mammalian egg. It later divides into the three germ layers from which the embryo develops.

blas′to·der·mat′ic (-dər-măt′ĭk), blas′to·der′mic adj.


1. (Biology) the layer of cells that surrounds the blastocoel of a blastula
2. (Biology) a flat disc of cells formed after cleavage in a heavily yolked egg, such as a bird's egg
Also called: blastodisc
ˌblastoˈdermic adj


(ˈblæs təˌdɜrm)

1. the primitive layer of cells that results from the segmentation of the ovum.
2. the layer of cells forming the wall of the blastula and in most vertebrates enclosing a cavity or a yolk mass.
blas`to•der′mic, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.blastoderm - a layer of cells on the inside of the blastulablastoderm - a layer of cells on the inside of the blastula
layer - thin structure composed of a single thickness of cells
References in periodicals archive ?
This gave the eggs time to dry and allowed the blastoderm to float upward and settle at the blunt end just beneath the air sac.
And even if they are fertilized, it takes time, temperature, and humidity for that blastoderm to become blood vessels capable of turning into a chick.
Gastrula stage took place from 20th h up to 40th h after post fertilization (2dpf) which is described as germ ring presence surrounding the margin of blastoderm and embryonic cover, that metamorphic from germ ring to animal pole to forming neural duct.
1995) for zebra fish, in which the blastoderm is formed by a single outer layer of flattened cells, known as the involucral outer layer, and a more rounded deep layer of cells.
This also allowed the blastoderm to rotate and come to lie above the blunt end which protected it from getting damaged while the drug was being injected at the lower end.
In turn this influences the number of cells contained by the blastoderm before incubation which determines embryonic viability (Mayes and Takeballi 1984; Meijerhof1992; Narushin and Romanov 2002).
Effects of Zinc deficiency on the chick embryo blastoderm.
Y blastoderm fydd yn y pendraw maes o law yn datblygu i roi'r ectoderm neu'r echgroen, yr endoderm a'r mesoderm.
In Drosophila, segmentation results from a simultaneous subdivision of the blastoderm.
In chicken embryos, myostatin expression can be detected as early as the blastoderm stage (Kocamis et al.