Blastocyst
an unfertilized egg
blastocyst The most versatile stem cells occur earliest in life. As a fertilized human egg divides, it first becomes a solid ball of cells, the morula. Next, about five days after fertilization, it becomes a hollow ball, the blastocyst. The cells of the outer layer of the blastocyst eventually form part of the placenta.
Human embryonic stem cells are typically extracted from the inner cell mass of a blastocyst, a structure that forms a few days after fertilization. The blastocyst is usually donated for research purposes with informed consent from the donors. Researchers can then extract the stem cells from the inner cell mass by using techniques that dissociate the cells from the embryo.
A blastocyst typically has around 100-200 cells by day 5 after fertilization. These cells are organized into an outer layer called the trophectoderm that will eventually form the placenta, and an inner cell mass that will develop into the embryo.
The collection of fertilized cells that is implanted in the uterus is called a blastocyst.
When the embryo reaches the uterus, it is a hollow ball of about 100 cells called a blastocyst. The blastocyst is made up of an outer layer of cells that will develop into the placenta and an inner cell mass that will develop into the embryo.
The other cells in the blastocyst will differentiate into the embryo itself. They will later develop into the various tissues and organs that make up the human body.
The group of approximately 100 cells that forms from a fertilized egg is called a blastocyst. It is the stage of development that precedes implantation in the uterus during early embryonic development.
Blastocyst
Blastocyst
About 100 cells make up a blastocyst.
an unfertilized egg
The inner cell mass of the blastocyst is the structure that becomes the embryo. It contains the cells that will develop into the fetus.
blastocyst The most versatile stem cells occur earliest in life. As a fertilized human egg divides, it first becomes a solid ball of cells, the morula. Next, about five days after fertilization, it becomes a hollow ball, the blastocyst. The cells of the outer layer of the blastocyst eventually form part of the placenta.
blastocyst The most versatile stem cells occur earliest in life. As a fertilized human egg divides, it first becomes a solid ball of cells, the morula. Next, about five days after fertilization, it becomes a hollow ball, the blastocyst. The cells of the outer layer of the blastocyst eventually form part of the placenta.
The blastocyst cells that do not become part of the human body form the placenta and other supporting tissues necessary for fetal development. These cells contribute to the formation of structures that facilitate the exchange of nutrients and waste between the mother and the developing embryo.