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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(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.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The outermost membrane, the chorion, overlays the viscous fluid-filled perivitelline space, the vitelline membrane, and the blastoderm (or embryo) and yolk (Jones et al., 1978; Rawson et al., 2000).
On their study, embryos reared at low temperature (16[degrees]C) showed abnormal organogenesis; however, normal development resumed when transferred to 22 or 24[degrees]C after blastoderm formation.
In some species (e.g., in the Caridea), blastomeres progressively become superficial and surround an acellular yolk, forming a superficial blastoderm from which a germ disk develops (Anderson, 1973: Dohle et al., 2004; Browne et al., 2005; Klann and Scholtz, 2014; Hertzler, 2015).
Blastula phase began from 4-20 h after post fertilization and one day after post fertilization, categorized with 2 different coatings of blastoderm, external outer layer and a periphery multinucleate mass of cytoplasm resulting from fusion of cells.
Being a nonmammalian species, the pluripotency of a chicken blastoderm at stage X was confirmed by chimera production and differentiation into various lineages [5, 6].
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.
Fertility can be determined by cracking the egg and looking at the blastoderm, which is a tiny white spot located on the yolk.
(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.
Cell death in the avian blastoderm: Resistance to stress-induced apoptosis and expression of anti-apoptotic genes.
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).
Eyal-Giladi, "Primordial germ cells of the young chick blastoderm originate from the central zone of the area pellucida irrespective of the embryo-forming process," Development, vol.