Parts of The Blastocyst
The blastocyst consists of two primary cell types:
- the inner cell mass, also known as the "embryoblast" (this part of the embryo is used in stem cell research)
- the trophoblast, a layer of cells surrounding the inner cell mass and the blastocyst cavity (blastocoele).
The former is the source of embryonic stem cells and gives rise to all later structures of the adult organism. The latter combines with the maternal endometrium to form the placenta in eutherian mammals.
Read more about this topic: Blastocyst
Famous quotes containing the words parts of the, parts of and/or parts:
“... the trouble is that most people in this country think that we can stay out of wars in other parts of the world. Even if we stay out of it and save our own skins, we cannot escape the conditions which will undoubtedly exist in other parts of the world and which will react against us.... We are all of us selfish ... and if we can save our own skins, the rest of the world can go. The best we can do is to realize nobody can save his own skin alone. We must all hang together.”
—Eleanor Roosevelt (1884–1962)
“The good parts of a book may be only something a writer is lucky enough to overhear or it may be the wreck of his whole damn life—and one is as good as the other.”
—Ernest Hemingway (1899–1961)
“I am a little world made cunningly
Of elements, and an angelic sprite;
But black sin hath betrayed to endless night
My world’s both parts, and Oh! both parts must die.”
—John Donne (1572–1631)