inner cell mass
A cluster of cells in a mammalian blastocyst that protrudes into one end of the cavity and subsequently develops into the embryo proper and some of the extraembryonic membranes.
inositol trisphosphate (IP3) ...
the inner cell mass, also known as the "embryoblast"
the trophoblast
The former is the source of embryonic stem cells and gives rise to all later structures of the adult organism.
the inner cell mass, which will become the baby, and
the trophoblast, which will
develop into the placenta and umbilical cord
and begin to secrete human chorionic gonadotropin (HCG).
Differentiating of inner cell mass of blastocyst
First month → beginning of a gut, developed kidney, brain, beating heart
Second month → all main organ systems present; embryo is called a fetus ...
The embryo proper begins to form from an inner cell mass within the blastocyst. Some parts of the blastocyst will form the extra embryonic membranes such as the amnion, chorion and parts of the placenta.
to use for tissue repair studies and so forth are derived from the very early embryo at the so-called blastocyst stage, which is where the embryo has first developed a cavity within it and there's a group of cells in there called the inner cell mass.
trophoblast - in a mammalian blastocyst, the outer superficial layer of cells surrounding the inner cell mass.
blastocyst 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).
 See also: Cells, Blastocyst, Embryo, Human, Cell
  
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