Crossword clues for blastocyst
blastocyst
The Collaborative International Dictionary
Blastocyst \Blas"to*cyst\, n. [Gr. blasto`s sprout + E. cyst.] (Biol.) The germinal vesicle.
Douglas Harper's Etymology Dictionary
Wiktionary
n. (context biology English) The mammalian blastula
WordNet
n. the blastula of mammals [syn: blastosphere]
Wikipedia
The blastocyst is a structure formed in the early development of mammals. It possesses an inner cell mass (ICM) which subsequently forms the embryo. The outer layer of the blastocyst consists of cells collectively called the trophoblast. This layer surrounds the inner cell mass and a fluid-filled cavity known as the blastocoele. The trophoblast gives rise to the placenta. The name "blastocyst" arises from the Greek βλαστός blastos ("a sprout") and κύστις kystis ("bladder, capsule").
In humans, blastocyst formation begins about 5 days after fertilization, when a fluid-filled cavity opens up in the morula, a ball consisting of a few dozen cells. The blastocyst has a diameter of about 0.1-0.2 mm and comprises 200-300 cells following rapid cleavage (cell division). After about 1 day (5–6 days post-fertilization), which is the time usually required to reach the uterus, the blastocyst begins to embed itself into the endometrium of the uterine wall where it will undergo later developmental processes, including gastrulation. Embedding of the blastocyst into the endometrium requires that it hatches from the zona pellucida, which prevents it from adhering to the oviduct as it makes its way to the uterus.The blastocyst is completely embedded in the endometrium only 11–12 days after fertilization.
The use of blastocysts in in-vitro fertilization (IVF) involves culturing a fertilized egg for five days before implanting it into the uterus. It can be a more viable method of fertility treatment than traditional IVF. The inner cell mass of blastocysts is also a source of embryonic stem cells.
Usage examples of "blastocyst".
A Barkakati-carrying cell was inserted into each of these enucleated blastocysts, where it began dividing like a freshly fertilized embryo.
The blastocyst just got transferred to the uterine replicator this morning.
Marg, though the implanted blastocyst that she was host-mothering could scarcely have been causing her any inconvenience yet.
She had lost the blastocyst implant during the retaking of the tree, Bram knew.
Satisfied with her intervention, she flowed the blastocyst down her fallopian tubes where it locked onto the wall of her uterus.
The four cells had been carefully separated, and each one allowed to divide to the blastocyst stage.
All four embryos were in the so-called blastocyst stage, in which the future child consists of a small cellular cluster at one end of a hollow ball of cells that will eventually form the fetal part of the placenta.
The cloned stem cells in therapeutic cloning are harvested from the blastocyst stage well before any embryo forms.
Stephanie would begin the process of harvesting the multipotential stem cells from the forming blastocysts, but until then she would have some free time.
The stem cells are harvested in the blastocyst stage before any cellular differentiation.