blastocyst


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to blastocyst: blastocyst transfer

blastocyst

 [blas´to-sist]
the mammalian conceptus in the post-morula stage, consisting of the trophoblast and an inner cell mass.
Early blastocyst. From Dorland's, 2000.

blas·to·cyst

(blas'tō-sist),
The modified blastula stage of mammalian embryos, consisting of the embryoblast or inner cell mass and a thin trophoblast layer enclosing the blastocystic cavity or blastocele.
[blasto- + G. kystis, bladder]

blastocyst

(blăs′tə-sĭst′)
n.
The modified blastula that is characteristic of placental mammals. Also called blastodermic vesicle.

blas′to·cys′tic adj.

blastocyst

A pre-implantation embryo consisting of a thin-walled hollow sphere of 16–40 cells, which appears in early mammalian development, the wall of which is the trophoblast. The embryo proper corresponds to a mass of cells at one side, which is equivalent to the blastula.

blas·to·cyst

(blas'tō-sist)
The modified blastula stage of mammalian embryos (including human), consisting of the embryoblast (inner cell mass) and a thin trophoblast layer enclosing the blastocystic cavity.
Synonym(s): blastodermic vesicle.
[blasto- + G. kystis, bladder]

blastocyst

The state of the development of the embryo at about eight days after fertilization, when implantation in the wall of the womb occurs. At this stage it consists of a double-layered sphere full of fluid. The outer layer, the trophoblast, forms the placenta, the inner layer forms the future fetus.

blastocyst

the BLASTULA of mammals, differing from that of lower vertebrates in consisting of an outer wall of cells, the TROPHOBLAST, by which the embryo implants in the uterus, and in having an inner cell mass, the embryonic disc, from which the embryo is formed.

Blastocyst

A cluster of cells representing multiple cell divisions that have occurred in the fallopian tube after successful fertilization of an ovum by a sperm. This is the developmental form which must leave the fallopian tube, enter the uterus, and implant itself in the uterus to achieve actual pregnancy.
Mentioned in: Infertility
References in periodicals archive ?
All of the embryos were cultured until the blastocyst stage (Figure 1).
Researchers take blastocysts, the clusters of cells formed several days after egg fertilization, from mutant animals missing specific organs and inject them with stem cells from a normal donor, not necessarily of the same species.
PGS can be used to screen embryo biopsies for aneuploidy before transplantation, and thus promote better pregnancy outcomes from IVF therapy.[14],[15] While embryo biopsies can be performed at the zygote (via the removal of 1-2 polar bodies), cleavage (via the removal of 1-2 blastomeres from a 6-8-cell embryo), and/or blastocyst (via the removal of 5-10 TE cells) stage of development,[16] PGS is currently predominantly conducted using blastocysts, since they exhibit both a low-mosaic rate and high developmental potential, and facilitate ICM evaluation.[17],[18] Specific indications for PGS include infertility at an advanced maternal age (>35 years), previous unsuccessful IVF treatments (i.e.
Table II.- Effect of sheep follicular fluid on maturation rate, cleavage rate and blastocyst rate of sheep embryos.
The diameter of each blastocyst was measured using a lens micrometer attached to an inverted light microscope (x320).
The results of the present study showed that freezing reduces the expression of EGFR in both 2-cell and blastocyst experiment groups.
The implementation of this innovative strategy, which is a simultaneous transfer of two embryos at different developmental stages, combines the advantages of blastocyst and cleavage stage transfer [20].
(2007) showed that parylene coating of microfluidic systems made of PDMS, which made the coating pinhole free, suppressed the increase of osmolality of the culture medium, and significantly improved blastocyst development of mouse embryos compared to the identical system with no parylene [8].
EPSCs are the first that can produce all three types of blastocyst stem cells, which gives them much greater potential for development.
Considering the complete automatization of the process, it takes 24h for the full procedure, meaning that the biopsy can be done on the third cultivation day and blastocyst embryo transfer can be performed on the fifth cultivation day without cryopreservation required [16].