Stage of development of the early embryo that has undergone blastulation, in which a fluid-filled cavity forms in the formerly solid ball of cells (the morula), about 5 days after fertilisation. For the first time, a distinction can be made between a sheet of cells to one side, which will form the embryo proper, termed the inner cell mass, and the remaining, peripheral cells that constitute the trophectoderm, which -- after the blastocyst "hatches" through the zona pellucida and undergoes implantation -- will form the trophoblast. An old-fashioned term for an inevitable miscarriage, meaning that the ovum (in its classical sense for professional embryologists) has not developed normally after fertilisation, there being present just the supporting tissues and no embryo. The term is descriptive, it has no diagnostic value as to the cause of the miscarriage.
(Greek, blastos = sprout + cystos = cavity) early stage in development before implantation, consists of outer trophoblast and inner cell mass.( More? Week 2 Notes)
The blastula of mammals: a sphere of cells (trophoblast) enclosing an inner mass of cells and a fluid-filled cavity (blastocoel).
a multicellular stage of pregnancy (pre-embryonic)
the fertilized egg after a number of cell divisions
An early-stage embryo (day 5 or 6) comprising 30-150 cells. The blastocyst consists of a sphere made up of an outer layer of cells (the trophectoderm), a fluid-filled cavity (the blastocoel), and a cluster of cells in the interior (the inner cell mass, from which stem cells may be derived). The size of a blastocyst is approximately 0.15mm.
in mammalian embryology, the preimplantation embryo consisting of a sphere of cells with an outer cell layer, a fluid-filled cavity, and a cluster of cells on the interior that is the inner cell mass
Stage of development of fertilized zygote after 32-celled morula. Blastocyst has fluid-filled cavity with lining cells and implants into uterine wall.
the preimplantation embryo formed following fertilization that is capable of attaching to the uterus and establishing a pregnancy.
An early stage of the developing embryo.
in the development of an embryo, a hollow ball of cells that consists of a blastocoel (the internal cavity), trophoblast (outer cells), and inner cell mass
a hollow ball of cells resulting after the morula has passed through the Fallopian tubes and enters the female uterus.
An advanced embryo, consisting of the cells that will form the fetus.
stage during early embryogenesis in mammals in which the embryo develops a fluid-filled interior and segregates into trophoblast and inner cell mass.
an embryo at the stage of development in which it consists of usually one layer of cells around a central cavity, forming a hollow sphere.
The name for the rapidly dividing fertilized egg once it enters the uterus
An advanced stage of embryo development during which a cavity develops within the young embryo.
Gk. blastos, sprout + kystis, sac] An embryonic stage in mammals; a hollow ball of cells produced one week after fertilization in humans.
The inner solid mass of cells within the morula.
The rapidly dividing fertilised egg at around the stage when it enters the uterus.
An early stage in the developing embryo, consisting of an outer trophoblast and an inner cell mass.
a ball of cells consisting of a hollow outer layer of cells, within which is a cluster of cells call the inner cell mass
a ball of cells that forms after the fertilized egg undergoes seven to nine divisions
a collection of undifferentiated cells, about a hundred or so
a highly developed embryo that has divided many times to a point where it is nearly ready to implant on the walls of the uterus
a highly organised mass of cells (about one hundred) which is ready to implant into the uterus, and form an early pregnancy
a hollow ball of cells containing two cell types
a hollow sphere of cells whose outer layer would develop into the placenta while the inner cell mass grew into a fetus
a many-celled embryo in the stage just prior to hatching, approximately five days after fertilization
a more advanced stage embryo
an early embryo, consisting of a sphere of cells enclosing an inner mass of cells and a central fluid-filled cavity
an early-stage human embryo created in a lab from an egg and a sperm
an embryo created during in vitro fertilization that has been grown in the laboratory for five to six days
an embryo that has been allowed to develop in the laboratory for five days or more after egg collection
a thin-walled hollow sphere made up of an outer layer of cells, a fluid filled cavity, and an inner cell mass containing pluripotent stem cells
A mammalian embryo in the first stage of development, when the fertilised egg has grown into a hollow ball made up of a few hundred cells. In humans, the blastocyst stage lasts from day 4-11 after fertilisation.
Early stage in development of animal, stage with a cavity, (blastocele), inner cell mass which gives rise to the embryo and outer cells which form the trophoblast
The early stage of embryonic development during which implantation occurs, approximately eight days after fertilization
an embryo with a cavity (blastocoele). This stage of development usually begins about day 8 of pregnancy in cattle.
In mammals, an early stage of embryonic development at which the embryo (roughly 100-200 cells) is a hollow sphere made up of an outer layer of cells (the trophectoderm), a fluid-filled cavity (the blastocoel), and a cluster of cells on the interior (the inner cell mass).
After a mammalian ovum is fertilised it begins to divide. The blastocyst is an early stage of this process which consists of a sphere that is fluid-filled and surrounded by a layer of cells, surrounding a fluid-filled cavity. There is a mass of cells at one side which will become the embryo. The blastocyst is formed before implantation into the uterus.
The mass of cells that form after several days of cell division by the fertilized egg.
An embryo that is 4-5 days old and is a hollow ball of cells.
Early embryo consisting of embryoblast and trophoblast.
A preimplantation embryo of 30 to 150 cells.
An advanced stage of embryo development (typically on Day 5 after fertilization) prior to hatching.
The preimplantation embryo of mammals consisting of a sphere of cells with an outer cell layer that forms the placenta and a cluster of cells on the interior called the inner cell mass that forms the embryo.
a stage of embryo development where a fluid filled cavity (blastocoele) separates the cells which will eventually form the fetus(inner cell mass) from the cells that will eventually make up the placenta(trophoblast)-there are about 200 cells present in the embryo at this stage
A 5- to 10-day-old embryo having two defined cell types. In mammalian development, cleavage produces a thin walled hollow sphere, whose wall is the trophoblast, with the embryo proper being represented by a mass of cells at one side. The blastocyst is formed before implantation and is equivalent to the blastula.
Refers to an embryo that has been developing for 5 – 6 days following fertilisation. to top of page
early stage in embryonic development (5-7 days after fertilization) before implantation; consists of outer trophoblast and inner stem cell mass.
A mammalian embryo before it implants in the uterus. An outer ring of cells surrounds the inner cell mass, which contains undifferentiated embryonic cells.
BLAS-toe-syst Stage of human prenatal development that is a hollow, fluid-filled ball of cells. 218
A stage of embryo development that occurs about five days after fertilisation when the embryo contains quite a few cells. A fluid filled sac forms in the mass of cells, fed by the outer layer of trophoblast of cells. The cells contained within the trophoblast layer will develop into the embryo, while the trophoblast cells form the placenta and membranes. Before this stage the embryo is occasionally referred to as the pre-embryo.
(Gr. blastos, germ + kystis, bladder). A morula with a fluidfilled cavity.
After the nucleus of a somatic cell is inserted into the place of the evacuated egg cell nucleus, the resulting cell begins to grow and divide. In three to five days, the resulting ball of cells is called a blastocyst. The sphere is made up of an outer layer of cells, a fluid-filled cavity, and a cluster of cells on the interior. This inner-cell mass of malleable stem cells are then extracted and grown in a petri dish for research or therapy.
an early stage in embryonic development consisting of a spherical clump of cells with an outer layer known as the trophoblast, a fluid filled cavity, and an Inner Cell Mass
an embryo of 30-150 cells before uterine implantation. It is composed of an outer layer of cells that will become the placenta, a fluid-filled cavity and an inner cell mass.
Multicellular embryo that is seen five to six days after fertilization.
A hollow ball of about 150 cells formed by repeated division of the fertilized egg before implantation in the uterus. The inner cell mass of the blastocyst later gives rise to the embryo. It is this cell mass that is the source of embryonic stem cells.
A stage of pre-natal mammalian development which (in humans) extends from the morula stage (a shapeless mass of cells about 4 days after fertilization), to an bilaminar (two layer) embryo stage (1 week after fertilization).
A pre-implantation embryo, approximately 5-7 days after conception (50-150 cells.)
The fertilized egg (zygote) once it enters the uterus
A hollow ball of 50 to 100 cells reached after about five days' embryonic development just before implantation in the uterus.
An embryo that may have developed five days after fertilization.
An early stage embryo (typically a few days after fertilisation), taking the form of a hollow ball of cells.
The developmental stage of the fertilized ovum by the time it is ready to implant; formed from the morula and consists of an inner cell mass, an internal cavity, and an outer layer of cells (the trophoblast).
The mammalian conceptus in the post-morula stage. It has a fluid filled cavity known as blastoceole and is not limited to one germ layer.
embryo development stage characterized by the formation of a cavity inside the morula (set of embryonic cells): the blastocœlium. ES cells can be injected in blastocysts to create chimeras or transgenic animals
A stage of embryo development approximately 5 or 6 days after egg collection.
The modified blastula stage of mammalian embryos, consisting of the inner cell mass and a thin trophoblast layer enclosing the blastocoel. Congestive heart failure: A condition in which the heart is unable to maintain adequate circulation of blood in the tissues of the body. This causes blood to back up in the veins leading to the heart, and sometimes causes fluid to build up in the legs or other parts of the body.
The fertilised egg at around the stage when it enters the uterus. The blastocyst continually and rapidly divides into more and more cells on the way to becoming an embryo.
(also blastocist) A mammalian embryo (fertilized ovum) in the early stages of development, approximately up to the time of implantation. It consists of a hollow ball of cells.
A mass of 150 or so cells that develops around 5-14 days after an egg is fertilized. This hollow ball is made up of an outer layer of cells (the trophectoderm), a cavity filled with fluid (the blastocoel), and a cluster of cells on the interior (the inner cell mass). Embryonic stem cells make up the inner cell mass. A blastocyst is smaller than the period at the end of this sentence.
a stage in human development, occurring 7 to 9 days after conception; consists of an outer layer that forms the placenta, and an inner pole from which the baby's body develops. See Embryo, Zygote.
endash; the developmental stage following morula, as this stage matures, the zona pellucia is lost allowing the coceptus to adplant and then implant into the uterine wall.
A preimplantation embryo of about 150 cells. The blastocyst consists of a sphere made up of an outer layer of cells (the trophectoderm), a fluid-filled cavity (the blastocoel), and a cluster of cells on the interior (the inner cell mass).
The stage at which an embryo acquires the ability to implant in the wall of the uterus. Embryos usually reach this stage 5-6 days after egg retrieval (ovulation).
an embryo that has grown for 5-6 days and has now developed a central cavity ready for implantation
The embryonic stage of development following the morula during the early stages of pregnancy. Spherical in shape, it consists of a mass of two layers of cells surrounding a fluid filled cavity, the blastocoele. The outer layer of cells, the trophoblast will develop to form the placenta, while the inner layer, the embryoblast, will become the fetus. The blastocyst usually implants itself in the wall of the uterus on the eighth day following fertilization. It is also known as the blastula.
At the stage when an embryo develops into a hollow ball of approximately 100 cells called, it is called a blastocyst, which contains a nub composed of embryonic stem cells that have the potential to become any cell in the body.
An embryo that is approximately five days old and consists of some 100 cells that form an outer layer surrounding a fluid core. The outer cells develop into the placenta, which protects the fetus created from the inner cells. Blastocysts are used in five-day in vitro fertilization transfers, typically allowing for the replacement of two embryos instead of three or four. This larger number is customary when embryos are transferred on the third day of development.
A fertilized egg which has developed to a ball of numerous cells after 5 days in culture.
Name used for an organism at the blastocyst stage of development.
a hollow sphere of cells formed four days after a sperm fertilizes an egg.
The stage of embryonic development that is reached about one hundred and twenty hours after fertilization. At this stage, a fluid-filled cavity (the blastocele) develops in the center of the embryo and cells begin to specialize. Some of them will go on to become the fetus, some will become the placenta.
a stage of development after the 32 cell morula. A blastocyst has a fluid-filled cavity with lining cells.
Multicell embryo that is seen five days after fertilization.
The rapidly dividing fertilized egg when it enters the uterus.
A fertilized egg after several days of cell division.
An embryo that has grown for approximately 5 days after fertilisation.
An advanced stage of embryo development, the embryo consists of an outer thin layer of cells, which later develops to placenta and an inner cell mass later develops to fetus.
The name given to the cluster of cells created from the fertilized egg before implantation in the uterus.
The small mass of cells that results from several days of cell division by the fertilized egg. Not yet an embryo.
An early stage of embryo development made up of a hollow sphere and an inner cell mass.
stage of embryonic development about 5 days post-fertilization
An early embryo comprising about 120 to 150 cells. A blastocyst is a sphere made up of an outer layer of cells (which later forms the placenta), a fluid-filled cavity and a cluster of cells on the interior (called the inner cell mass).
Five-six days after fertilisation, at 'normal' implantation time, the multiple cell embryo develops a cystic central structure.
A very early embryo consisting of approximately 150-300 cells. The blastocyst is a spherical cell mass produced by cleavage of the zygote (fertilized egg) after approximately 5-7 days of cell divisions. It contains a microscopic cluster of cells called the inner cell mass (from which embryonic stem cells are derived) and an outer layer of cells called the trophoblast (that forms the placenta).
a hollow ball of cells that develops from the fertilized egg. The blastocyst moves to the uterus and attaches to the uterine lining. The blastocyst continues to grow and divide until it becomes an embryo.
A very young embryo that contains 200 to 250 cells and is shaped like a hollow sphere.
An embryonic stage of development occurring on day 5 or 6 after fertilization.
A very early embryo consisting of approximately 100 to 150 cells. The blastocyst is a microscopic, hollow ball that develops in the first five to seven days of development. It contains a fluid-filled cavity, a cluster of cells called the inner cell mass (from which embryonic stem cells are derived) and an outer layer of cells called the trophoblast (which becomes the placenta).
A sphere of cells containing a fluid-filled cavity forming about 4 days after fertilization and prior to the beginning of implantation.
The developing multi-cell embryo at approximately 5-7 days after fertilization occurs.
An embryo that has developed for five days after fertilization. At this point theembryo has two different cell types and a central cavity. The surface cells (trophectoderm) will become the placenta, and the inner cell mass, will become the fetus. A healthy blastocyst should hatch from the zona pellucida by the end of the sixth day. Within about 24 hours after hatching, it should begin to implant into the lining of the uterus.
Early stage of the developing egg when it has segmented into a group of cells.
The fluid-filled cluster of cells formed soon after conception that multiplies rapidly and settles in the uterus where it divides into the placenta and the fetus.
The blastocyst is the structure formed in early mammalian embryogenesis, after the formation of the blastocele, but before implantation. It possesses an inner cell mass, or embryoblast, and an outer cell mass, or trophoblast. The blastocyst is usually comprised of 200 cells.