blastocyst


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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

/blas·to·cyst/ (-sist) the mammalian conceptus in the postmorula stage, consisting of an embryoblast (inner cell mass) and a thin trophoblast layer enclosing a blastocyst cavity.

blastocyst

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

blas′to·cys′tic adj.

blastocyst

[blas′təsist]
Etymology: Gk, blastos + kystis, bag
the embryonic form that follows the morula in human development. Implantation in the wall of the uterus usually occurs during this stage, approximately 8 to 13 days after fertilization. The blastocyst consists of an outer layer (trophoblast) which is attached to the inner cell mast.
enlarge picture
Early blastocyst

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

blastocyst

the mammalian conceptus in the post-morula stage, consisting of the trophoblast, an inner cell mass, and a central, fluid-filled cavity.
References in periodicals archive ?
EPSCs are the first that can produce all three types of blastocyst stem cells, which gives them much greater potential for development.
japonicus extracts were an effective means to induce developmental competence and blastocyst quality in bovine embryos.
2] and air for four days until the blastocyst stage (Figure ID).
It has been hypothesized that blastocyst stage ET would permit the identification of embryos that could maintain their developmental process and, thus, allow the recruitment of good quality embryos with enhanced developmental ability Therefore, it has been suggested that the blastocyst transfer at day 5 would succeed the highest pregnancy rates with the least number of embryos (5-7).
However, the IVC is the last step in the IVP, the longest and the most decisive for the quality of the blastocyst [27].
The blastocyst rate in the 560 ng/uL Npm injected group was significantly higher than those injected with 2500 ng/uL, 500 ng/uL, 100 ng/uL PGA groups and control group (P<0.
On the other hand, some researchers are of the opposite opinion, and they think that the embryos which did not reach the stage of blastocyst were not of good quality even at the stage of cleavage.
Embryo development is an extremely complex process and while our system may not be able to fully reproduce every aspect of this process, it has allowed us to reveal a remarkable self-organising capacity of human blastocysts that was previously unknown," Marta Shahbazi, a researcher at the University of Cambridge who co-authored one of the studies, said in a statement.
In the new research, scientists removed cells from the blastocyst at around day six and grew them individually in culture.
2] (0-50 [micro]M) for 30 or 60 min; the results showed a negative dose-effect on blastocyst rate [12].
Cleavage and blastocyst rates were determined under a stereomicroscope after 48 h and 144-168 h of in vitro culture respectively.