Blastocyst


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

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 ?
After being washed and fixed, the blastocyst was permeabilized for staining.
Day 3 transfer using the automated time-lapse enable Eeva Test results in similar clinical pregnancy and implantation rates to blastocyst transfer: a longitudinal cohort study.
But the formation of the blastocyst implies the first distinction between cell types.
Published in Reproductive BioMedicine Online, the study showed how abnormalities in five-day old human blastocysts can be identified by the rate at which they have developed, meaning the researchers could establish risk of genetic abnormality without a biopsy.
What we've been able to show is that a woman aged 38 to 42, if she has a blastocyst with a normal number of chromosomes, her chances of implantation are independent of her age.
Similarly, the overall blastocyst rates were significantly higher in FBS supplemented groups.
The number of embryos recommended for transfer increases with age, with no more than five cleavage-stage embryos or three blastocysts to be transferred in women aged 41-42 years.
Upon removal of the cryoprotectants, the embryos were incubated for 72 hours and assessed for blastocyst development based on morphology.
At this point the egg is "tricked" into dividing and becoming a very early embryo, otherwise known as a blastocyst.
A blastocyst is a set of from eight to about 200, undifferentiated cells.
2) Before the mid-1990s, low production and accompanying low viability of blastocysts during human IVF due to the inability of any single culture medium to meet and sustain the changing nutritional requirements of preimplantation embryos resulted in blastocyst transfer being abandoned.
Embryos were scored for development to blastocyst, mean cell number per embryo, and percentage of apoptosis after 96-hr incubation in controls, individual pesticides, and mixtures at low-dose concentrations based on 1x RfD values.