embryonic disk


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embryonic disk

n.
1. A platelike mass of cells in the blastocyst from which a mammalian embryo develops. Also called embryonic shield.
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.

em′bryon′ic disk′


n.
1. in the early embryo of mammals, the flattened inner cell mass that arises at the end of the blastocyst stage and from which the embryo begins to differentiate.
2. the blastodisk of yolky eggs.
[1935–40]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
Gastrulation is the process whereby the bilaminar embryonic disk is converted into a trilaminar disk, which occurs in the third gestational week.
These cells give rise to the embryonic disk of the later embryo and, ultimately, the fetus.
They result from incomplete division of the embryonic disk. (1) The incidence is estimated at about 1 in 250 000 live births, with a strong female predominance.