Definitions
from The Century Dictionary.
- noun In biology, the outermost recognizable structure of a cell; a cell-wall, in any way distinguished from mesoblast or other more interior structures. The ectoblast is to a cell what the epiblast is to a more complex organism.
- noun In embryology, the outer primary layer in the embryo of any metazoan animal; the epiblast; the ectoderm. See cut under
blastocæle .
from the GNU version of the Collaborative International Dictionary of English.
- noun The outer layer of the blastoderm; the epiblast; the ectoderm.
- noun The outer envelope of a cell; the cell wall.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun dated, biology the outer layer of the
blastoderm ; theectoderm orepiblast
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the outer germ layer that develops into skin and nervous tissue
Etymologies
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Examples
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The former is often also called the ectoblast, or epiblast, and the latter the endoblast, or hypoblast.
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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The entire ectoderm arises from the first, second and third micromere quartets (collectively, the 'ectoblast').
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This process goes on till all the cells are so filled by the mesoblast, with its myriad brood of cells, that the outer sac or ectoblast becomes a mere halo around it.
The Atlantic Monthly, Volume 10, No. 61, November, 1862 Various
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In this form, he says, the progaster is already developed, and its wall is differentiated for the first time into an animal or dermal layer (ectoblast), and into a vegetative or intestinal layer (hypoblast).
The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality Rudolf Schmid
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When the mesoblast has become thus infinitely subdivided into hundreds of minute spheres, the ectoblast bursts, and the new generations of cells thus set free collect in that part of the egg where the embryonic disk is to arise.
The Atlantic Monthly, Volume 10, No. 61, November, 1862 Various
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But in all other animals the ovum first grows into two primary layers, the outer or animal layer (the ectoderm, epiblast, or ectoblast), and the inner or vegetal layer (the entoderm, hypoblast, or endoblast); and from these the tissues and organs are formed.
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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B longitudinal section through the axis, g primitive-gut cavity, a primitive mouth-aperture, i inner cell-layer (entoderm, endoblast, gut-layer), e external cell-layer (outer germinal layer, ectoderm, ectoblast, or skin-layer).
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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(B) Schematic showing ontogeny of ectoblast cell distributions relative to the secondary axis.
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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Oppositely, the vegetal extremities of the ectoblast
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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LR1, and that the progress of epiboly over the next three or four hours coincides with mitotic quiescence of the ectoblast.
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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