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Related to blastocoel: blastopore, Blastomeres


or blas·to·coele  (blăs′tə-sēl′)
The fluid-filled, central cavity of a blastula. Also called segmentation cavity.

blas′to·coe′lic 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.


(ˈblæstəʊˌsiːl) or


(Biology) embryol the cavity within a blastula. Also called: segmentation cavity
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈblæs təˌsil)

the cavity of a blastula arising in the course of cleavage.
blas`to•coel′ic, 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.blastocoel - the fluid-filled cavity inside a blastulablastocoel - the fluid-filled cavity inside a blastula
blastosphere, blastula - early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs
bodily cavity, cavum, cavity - (anatomy) a natural hollow or sinus within the body
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Minimally invasive or non-invasive strategies include the analysis of blastocoel fluid and spent culture media, both of which have demonstrated the presence of genetic material (11-14).
On day 5 of in vitro cultivation, resulting blastocysts were evaluated morphologically.[4] Initially, they were assigned a numeric score (between 1 and 6) based on their degree of expansion, and hatching status: (1) early blastocyst (i.e., where the blastocoel formed less than half of the volume of the embryo); (2) blastocyst, (where the blastocoel formed more than half of the volume of the embryo); (3) full blastocyst, (where the blastocoel completely filled the embryo); (4) expanded blastocyst, (where the blastocoel volume was larger than that of the early embryo, and the zona had begun to thin); (5) hatching blastocyst, (where the TE had begun to herniate though the zona); and (6) hatched blastocyst, (where the blastocyst had completely escaped from the zona).
Blastocysts were categorized as Grade I; excellent or good quality blastocysts with blastocoele filling the entire blastocyst, compact inner cell mass (ICM), multicellular cohesive trophectoderm (TE) and oval shaped, Grade II; moderate quality blastocysts with normal ICM, but no optimal (fragmented or necrotic) TE, and Grade III; poor quality blas tocysts with very few cells or without ICM and with large vacuole instead of blastocoel.
Because of the invariant cell fate in the Dendrobranchiata, a pair of future mesendodermal cells undergoes arrest, ingresses to a yolk-free blastocoel, and organizes following gastrulation movements during later stages.
This shift is driven in part by the exponential increase in cell number from the morula to the blastocyst stage, and by the energy required to generate and maintain the blastocoel (reviewed by [53]).
Metabolic characterization of the bovine blastocyst, inner cell mass, trophectoderm and blastocoel fluid.
At this stage a space was formed between yolk and blastoderm which is called blastocoel. This stage of embryo is called blastula' (Figure -1 B).
Citrate stimulates fatty acid synthesis (8) and is a chelator of metal ions (e.g., Ca2+), a feature that may be of importance for maintaining junctional integrity and thus of importance for compaction and blastocoel formation (9).
Developmental Stage Time(h or days) Oviposition 0 h First division 6 [+ or -] 1 h of cleavage Four-cell stage 8 h Eight-cell stage 11 h Morula 16 h Blastula, appearance of blastocoel 2 days Gastrula 2 days Motion of larvae by velar rudiment 3 days Early veliger stage, velum visible, viscera 4 days differentiated in stomach, left and right digestive diverticulum, shell color changed to purple Hatched 6 days No.
Even in larger embryo fossils estimated to contain 1,000 cells or more, the scientists did not observe a blastocoel, a fluid-filled gap in the middle of the embryo and a common feature among modern animal embryos.
However, there was no sign of a blastocoel, a fluid-filled hole in the centre which is a common feature of modern animal embryos.
Blastocyst--A sphere made up of an outer layer of cells (the trophectoderm), a fluid-filled cavity (the blastocoel), and a cluster of cells on the interior (the inner cell mass).