Blastocyst

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Related to blastocysts: Blastocystis hominis

blastocyst

[′blas·tə‚sist]
(embryology)
A modified blastula characteristic of placental mammals.

Blastocyst

 

blastodermic sac, a stage in the development of mammal embryos, including humans, that arises as a result of cleavage of the fertilized ovum. The blastocyst is a hollow sac. An aggregate of cells—a node, analogous to the blastula of other animals—is found on one side of it. The outer wall of the blastocyst forms the trophoblast.

References in periodicals archive ?
Finally, the expression of apoptotic factor (cleaved caspase-3) and the index of apoptotic cells were investigated in bovine blastocysts after treatment with P amurense and H.
Birth rates for matured embryos according to the study groups Groups Blastocysts Birth rate N N (%) [alpha]-MEM 17 8 (47.
Patients aged 41-42 years should receive single blastocyst transfer if euploid embryos are available, or no more than four cleavage-stage embryos or three blastocysts.
Influence of group embryo culture strategies on the blastocyst development and pregnancy outcome.
he other two types of stem cell in the blastocyst are the extra-embryonic trophoblast stem cells (TSCs), which will form the placenta; and primitive endoderm stem cells that will form the so-called yolk sac, ensuring that the fetus's organs develop properly and providing essential nutrients.
Morulae and blastocysts yield were evaluated, respectively, on the sixth and seventh day after IVF.
Moreover, the blastocyst rate was highest in injection 560 ng/uL Npm group and was lowest in injection 100 ng/uL PGA group.
Some authors are of the opinion that the embryos which are of good quality at the stage of cleavage should be transferred on day 3, otherwise they will not survive prolonged culturing to the stage of blastocysts.
All remaining data, including fertilization and monospermic penetration rates, IVF efficiency and blastocysts total cell number were analyzed by ANOVA and compared through the Tukey test.
Although the blastocyst stage of human embryos has been extensively studied and documented, what happens beyond the seventh day of fertilization - when the embryo must implant itself into the uterus to survive - still remains shrouded in mystery.